Removed special Sculpt Mode undo code. Sculpt Mode undo is no longer so useful, since in order to make it more correct it has gotten slower, so normal BIF_undo_push is used now. Fixes bug with Shape Keys, sculpting on a shape key wasn't doing undo properly.
* Replaced get_tex_angle() with tex_angle() and set_tex_angle(). This removes the need to do a bunch of error-prone NULL checking everywhere the texture angle is used.
When in sculptmode, enter editmode, add faces or vertices, exit editmode,
then undos/redos screw up mesh.
Now the stack for sculpt is freed. Later on one could precisely test why
this undo isn't resistant to such changes.
http://projects.blender.org/pipermail/bf-committers/2006-November/016311.html
As recommended on bf-committers, I created an entirely separate section for
sculptmode hotkeys, so none of the standard hotkeys in space.c carry over.
(However, the standard hotkeys in toets.c are left unchanged.)
There are probably some useful hotkeys that have been disabled with this commit,
and other hotkeys that still need to be added, so this needs review.
