Finally started working on the new keymap again.

- Tweaked knife tool: right-click now completes rather than cancels.
  This is consistent with e.g. loop cut, where right click only
  cancels the next step, not the entire operation.
- Added sculpt mode keymap.  Didn't see much that needed to change
  here.  Only minor tweaks from the current keymap.
- Added keymap for the text editor.  Right now it's pretty much identical
  to the old keymap.  Need to consider if it needs changes or not.  But
  for now this will work fine.
- Added keymap for the console.  Identical to old keymap.  May need
  minor tweaks, but is quite good as-is.
- Added keymaps for frame stepping, timeline scrubbing, and managing
  markers.

The mesh-edit and sculpt mode keymaps should be essentially "complete" now.
Which isn't to say further changes can't/won't be made, but rather that
I think people can start using them for serious work now.  A tutorial/
overview may be in order.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/contrib@4590 96b784f8-4ae3-dd11-aff7-0030488c597c
fixed + adding back add_scene_elements for future development

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/contrib@4591 96b784f8-4ae3-dd11-aff7-0030488c597c