Reintroducing Unload functions. Is*Ready functions. GC_UNLOAD setting and check function.

include/lua_core.h

@@ -57,6 +57,7 @@ Ray uluaGetRay( lua_State *L );
 Ray uluaGetRayIndex( lua_State *L, int index );
 NPatchInfo uluaGetNPatchInfo( lua_State *L );
 NPatchInfo uluaGetNPatchInfoIndex( lua_State *L, int index );
+Buffer* uluaGetBuffer( lua_State *L, int index );
 Image* uluaGetImage( lua_State *L, int index );
 Texture* uluaGetTexture( lua_State *L, int index );
 RenderTexture* uluaGetRenderTexture( lua_State *L, int index );
@@ -83,6 +84,7 @@ void uluaPushMatrix( lua_State *L, Matrix matrix );
 void uluaPushRay( lua_State *L, Ray ray );
 void uluaPushRayCollision( lua_State *L, RayCollision rayCol );
 void uluaPushBoundingBox( lua_State *L, BoundingBox box );
+void uluaPushBuffer( lua_State *L, Buffer buffer );
 void uluaPushImage( lua_State *L, Image image );
 void uluaPushTexture( lua_State *L, Texture texture );
 void uluaPushRenderTexture( lua_State *L, RenderTexture renderTexture );