viewer: Improve HD playback performance with effects by restricting resolution
render: Reset the restriction caps right before rendering
Improve some debug statements in viewer.py and project.py
viewer: Don't set the playback controls immediately active on startup

This occurs later when the timeline duration changes anyway.
[WIP BUGGY] viewer: During save, temporarily reset restriction caps to project settings

BUG: any restriction caps applied will make the pipeline go to pause...
which is not what you'd expect when your project has unsaved changes,
you're playing and it suddenly stops because it saved a backup of the project...