Canvases and Images are now subclasses of the new Texture class.
Added setTexture and getTexture methods for Meshes, ParticleSystems, and SpriteBatches (the old set/getImage methods are deprecated but not removed.)
Canvas texture coordinates are no longer flipped.
This should *only* be used for debugging: the wireframe lines behave differently from regular love.graphics lines, and the functionality may not work on OpenGL ES.