[FEATURE] Move and Copy nodes

Move and Copy nodes:

__Tasks:__

- [x] test coverage
- [ ] gather feedback for my changes
- [x] submit changes to the documentation
- [x] content mapper: move
- [x] content mapper: copy
- [x] UI (https://github.com/sulu-cmf/SuluContentBundle/pull/171)
- [x] Husky fixes (https://github.com/massiveart/husky/pull/337)

__New Issues:__
- https://github.com/sulu-cmf/sulu/issues/178


__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | https://github.com/sulu-cmf/sulu-standard/issues/122 , https://github.com/sulu-cmf/sulu-standard/issues/123
| BC Breaks     | no
| Doc           | https://github.com/sulu-cmf/docs/blob/master/detail-specification/300-webspaces/DET-311-ContentMapper.md#copy--move
@dantleech "one day" is the right phrase here ;-) Would you mind creating an issue?