Some Lua Stuff

[menvae]

Changes

• fixed stack overflow which was caused by:
  • static properties if they referenced the same type
  • fields that reference the same type (MUST be guarded with [JsonIgnore])
• fixed lua blend modes
• added Color4 to lua
• added Vector2 to lua just in case something uses it in the future
• added new HitObjectType
• added ability to filter by HitObjectType in NotesInRange. Omit the arg to get all.
• added explicit conversion to lua models
• added debugging for depth so it's easier to check when issues arise in the future

[menvae]

Todo:

• Add lua type convertion in lua extensions (Vector2 -> LuaVector2)
• Rename osuTK.graphics.vector2 to correct name

Putting this here so I don't forget later