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

servers/visual/rasterizer/rasterizer_canvas_rd.h

@@ -0,0 +1,28 @@
+#ifndef RASTERIZER_CANVAS_RD_H
+#define RASTERIZER_CANVAS_RD_H
+
+#include "servers/visual/rasterizer/rasterizer.h"
+
+class RasterizerCanvasRD : public RasterizerCanvas {
+public:
+	RID light_internal_create() { return RID(); }
+	void light_internal_update(RID p_rid, Light *p_light) {}
+	void light_internal_free(RID p_rid) {}
+
+	void canvas_begin(){};
+	void canvas_end(){};
+
+	void canvas_render_items(Item *p_item_list, int p_z, const Color &p_modulate, Light *p_light, const Transform2D &p_transform){};
+	void canvas_debug_viewport_shadows(Light *p_lights_with_shadow){};
+
+	void canvas_light_shadow_buffer_update(RID p_buffer, const Transform2D &p_light_xform, int p_light_mask, float p_near, float p_far, LightOccluderInstance *p_occluders, CameraMatrix *p_xform_cache) {}
+
+	void reset_canvas() {}
+
+	void draw_window_margins(int *p_margins, RID *p_margin_textures) {}
+
+	RasterizerCanvasRD() {}
+	~RasterizerCanvasRD() {}
+};
+
+#endif // RASTERIZER_CANVAS_RD_H