Blender Git Loki

Graph Editor - Restored all Transform tools

I've ported the transform tools for this editor as they existed in the AnimSys2 branch (minus some of the experimental pivot options which were not useful enough yet).

Hotkeys are:
* GKEY - transforms points as always
* RKEY - rotates points (only useful for a single 'knot')
* SKEY - scales points
* EKEY - like in the DopeSheet, the 'extend' translation tool only moves all the keyframes on the same side of the current frame indicator as the mouse

Useful tweaks ported from AnimSys2 include:
* Auto-snapping is on by default for time-values on the keyframes only. Handles are not snapped (or shouldn't be).
* Rotating/Scaling new keyframes using default handles (i.e. Auto-Handles) now works, as the handle is now converted to aligned so that changes can be seen.