Improvements to command repetition.

- Apply repeatable commands in order.
- Move command repetition to menu.
- Minor changes.
Fixed Quake 2 monster models.

- Berserk was missing the model key.
- Brain was loading the wrong model.
Show angle indicators for partially selected entities.
Add keyboard shortcuts to rotate tool

Arrow keys and pgup / pgdown
- move objects as usual
- with shift: move rotation center
- with alt: rotate objects with current angle