Blender Git Loki

* Added control and animation of sound volume of sequence sound strips (found in properties pane)

To insert keys, use I key while hovering over the button for now, rmb clicking on the property to insert a key doesn't work (general bug for all regions except property editor - will investigate).

Doesn't convert over from old fac0 ipos on opening old files though for the time being.

* Made sequence strip names unique while I was at it, to allow strip properties to be animated properly.