Blender Git Loki

Keymap: RMB select option to place cursor on Alt-LMB

This allows most tools to activate on press, removing a small but
noticeable distance between the initial press and detection of a drag
event.

Gizmo tweak no longer actives when Alt is held, to avoid conflicting
with cursor placement.

This has the advantage that the gizmo doesn't get in the way when Alt
is used for activating tools or placing the cursor.