vrchat plus photos, icons, emoji apis not covered

the specification doesnt seem to cover these vrchat plus features.

**photo upload**
POST https://vrchat.com/api/1/file/image
file: (binary)
tag: gallery

**icon upload**
POST https://vrchat.com/api/1/file/image
file: (binary)
tag: icon

**emoji upload**
POST https://vrchat.com/api/1/file/image
file: (binary)
tag: emoji
animationStyle: bats
maskTag: square