Blender Git Loki

Made a vertex selection keymap for weight paint so that the
'A' key could override pose mode's select all (like face mask)
Minor note, changed the icon to the vertex selection icon, but it still doesn't force face mask to turn off.

Clipping is still not functional in wp.
And I'll need to hear how the backbuffer select is supposed to work for lasso select since the selection is arbitrary.