MSVC allows backslashes and case-insensitive include paths, which causes
build failures on other compilers. This commit:
- Converts all include backslashes to forward slashes.
- Fixes capitalization mismatches to match the actual filesystem.
- Skip frustum culling for the entity the player is currently riding, preventing the horse from disappearing when looking up (fixes a bug reported on Discord)
- Fix HorseRenderer::bindTexture() to delegate to base class for single textures (fire atlas, enchant glint), only using bindTextureLayers() for multi-layer horse textures
Co-authored-by: MCbabel <MCbabel@users.noreply.github.com>
