More installer fixes
fix unit sprite glitch that's been annoying me

unit sprites need an extra 50% either side when aiming to allow for the
full length of the weapon they are firing to be displayed
whoops
Getting rid of timidity references
Update Mac instructions
- Highlight TUs in red on the shot selection menu if insufficient.
- Highlight Acc in red if the weapon has insufficient ammo.
- Display auto shot count as ##%x<Count>.
- Display wounded days with status.
- Handle thrown items in ammo count check.
- Remove user preferences.
Merge branch 'master' of https://github.com/Darineth/OpenXcom