Tile border enhancements

[sowelipililimute]

implementation

• ITileDefinitions now have a BordersMode field that affects rendering
  • Exterior8Patch: old behaviour, up to 8 sprites on the neighbouring tiles
  • Interior8Patch: up to 8 sprites on the current tile based on neighbours
  • Interior4Of16: up to 4 sprites on the current tile out of 16 variants based on neighbours
• Interior4Of16EdgeSprites that holds the sprites for the 4-of-16 mode

content build failure

• this needs new storage for the 4-of-16 sprites and i'm not about to hijack the Direction enum for that

what it looks like

left: interior 8-patch
right: interior 4-of-16
each colour is its own image

[AftrLite]

🤤 yummy.. yummers.. spriters eating good today... (i'm spriters)

[Princess-Cheeseballs]

Looks good,
The massive if statement is horrific and frightening, but it's readable and optimizing it would reduce its readability for like only nanoseconds of gain.