Minor changes

Some minor changes I have had in flight for a little while:
- Removed non-working mirror code, just couldn't get it to work at all
- Disconnected Screen View now glides in and out (rather than snapping),
looks much nicer and should be more comfortable for regular use
- Tweaked positional tracking ratios, these numbers are better than the
previous
- Added the scalers for X/Y/Z positional tracking ratios to the Pos
Tracking menu, so users can change them if they way - They are also
persisted to the profiles.xml
-Started to add support for The Stanley Parable