Compositor: Add support for canvas compositing

This patch adds functionality for operations that require pixels
translation or resizing on "Full Frame" mode, allowing to adjust
their canvas within the output canvas. It fixes current cropping
issues in translate, scale, rotate and transform nodes by adjusting
their canvas to the result, instead of the input canvas.
Only the scale node canvas is limited to the scene output
resolution size for performance reasons as there are many
operations that require their whole input to be rendered.

Operations output buffer is still always on (0,0) position for
easier image algorithm implementation, even when operation
canvas is not.

Compositor: Replace resolution concept by canvas

This is a code refactor in preparation of supporting canvas
compositing.

No functional changes, all canvases are at (0, 0) position matching
tiled implementation.