- added new OCA.Files namespace for files classes
- the sidebar can now switch between views/containers
- the trashbin renders in its own container but currently doesn't work
due to overrides
- added app.js as entry point for JS code (ideally all other files should
only contain classes and not trigger anything)
- Also fixes a few JSHint warnings in files app
- Added "global" comment on top of files app to suppress warning and
also inform devs about what globals are use
