New lightmapper

-Added LocalVector (needed it)
-Added stb_rect_pack (It's pretty cool, we could probably use it for other stuff too)
-Fixes and changes all around the place
-Added library for 128 bits fixed point (required for Delaunay3D)

drivers/vulkan/rendering_device_vulkan.h

@@ -1138,6 +1138,8 @@ public:
 
 	virtual RenderingDevice *create_local_device();
 
+	virtual uint64_t get_memory_usage() const;
+
 	RenderingDeviceVulkan();
 	~RenderingDeviceVulkan();
 };