Improve config errors

[Seggan]

• Adds context file to config errors
• Improves error messages within config adapters
• Improves config adapter code in general

Before:

java.lang.ExceptionInInitializerError
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.guide.pages.settings.BlockTextureSettingsPage.<clinit>(BlockTextureSettingsPage.kt:14) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.guide.pages.settings.ResourcePackSettingsPage.<clinit>(ResourcePackSettingsPage.kt:13) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.guide.pages.settings.MainSettingsPage.<clinit>(MainSettingsPage.kt:18) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.content.guide.RebarGuide.<clinit>(RebarGuide.kt:140) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.Rebar.onEnable(Rebar.kt:140) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279) ~[paper-api-1.21.11-R0.1-SNAPSHOT.jar:?]
	at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.11-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:639) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:596) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:321) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1260) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:388) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.IllegalArgumentException: Failed to convert value 'MemorySection[path='custom-block-textures.culling.presets', root='YamlConfiguration']' to type java.util.Map<java.lang.String, io.github.pylonmc.rebar.resourcepack.block.CullingPreset> for key 'custom-block-textures.culling.presets' in section ''
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.ConfigSection.getOrThrow(ConfigSection.kt:77) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.RebarConfig$BlockTextureConfig.<clinit>(RebarConfig.kt:147) ~[?:?]
	... 15 more
Caused by: java.lang.IllegalArgumentException: Culling preset is missing 'index' field
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.CullingPresetConfigAdapter.convert(CullingPresetConfigAdapter.kt:12) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.CullingPresetConfigAdapter.convert(CullingPresetConfigAdapter.kt:6) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.MapConfigAdapter.convert(MapConfigAdapter.kt:21) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.MapConfigAdapter.convert(MapConfigAdapter.kt:16) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.MapConfigAdapter.convert(MapConfigAdapter.kt:7) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.ConfigSection.getOrThrow(ConfigSection.kt:75) ~[?:?]
	... 16 more

After:

java.lang.ExceptionInInitializerError
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.guide.pages.settings.BlockTextureSettingsPage.<clinit>(BlockTextureSettingsPage.kt:14) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.guide.pages.settings.ResourcePackSettingsPage.<clinit>(ResourcePackSettingsPage.kt:13) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.guide.pages.settings.MainSettingsPage.<clinit>(MainSettingsPage.kt:18) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.content.guide.RebarGuide.<clinit>(RebarGuide.kt:140) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.Rebar.onEnable(Rebar.kt:140) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279) ~[paper-api-1.21.11-R0.1-SNAPSHOT.jar:?]
	at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.11-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:639) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:596) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:321) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1260) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:388) ~[paper-1.21.11.jar:1.21.11-69-94d0c97]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: io.github.pylonmc.rebar.config.ConfigSection$KeyNotFoundException: Key 'custom-block-textures.culling.presets.disabled.index' not found in config file /home/seggan/Progs/Kotlin/pylonmc/run/plugins/Rebar/config.yml
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.ConfigSection.getOrThrow(ConfigSection.kt:73) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.CullingPresetConfigAdapter.convert(CullingPresetConfigAdapter.kt:12) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.CullingPresetConfigAdapter.convert(CullingPresetConfigAdapter.kt:6) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.MapConfigAdapter.convert(MapConfigAdapter.kt:21) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.MapConfigAdapter.convert(MapConfigAdapter.kt:16) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.adapter.MapConfigAdapter.convert(MapConfigAdapter.kt:7) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.ConfigSection.getOrThrow(ConfigSection.kt:75) ~[?:?]
	at rebar-1.0.0-SNAPSHOT.jar//io.github.pylonmc.rebar.config.RebarConfig$BlockTextureConfig.<clinit>(RebarConfig.kt:147) ~[?:?]
	... 15 more

[LordIdra]

nice

Not thoroughly reviewed all code but changes look good at a high level