Texture refactor

-Texture renamed to Texture2D
-TextureLayered as base now inherits 2Darray, cubemap and cubemap array
-Removed all references to flags in textures (they will go in the shader)
-Texture3D gone for now (will come back later done properly)
-Create base rasterizer for RenderDevice, RasterizerRD

modules/dds/texture_loader_dds.cpp

@@ -457,7 +457,7 @@ void ResourceFormatDDS::get_recognized_extensions(List<String> *p_extensions) co
 
 bool ResourceFormatDDS::handles_type(const String &p_type) const {
 
-	return ClassDB::is_parent_class(p_type, "Texture");
+	return ClassDB::is_parent_class(p_type, "Texture2D");
 }
 
 String ResourceFormatDDS::get_resource_type(const String &p_path) const {