simplifying Warsow-style physics code even more, as it now can use a common code...

simplifying Warsow-style physics code even more, as it now can use a common code path with Quake-style physics (the only difference there is is when moving forward only).

This could be done after the observation that CPMA-style acceleration never kicks in in Warsow mode.

The sv_aircontrol is now expected to be zero in Warsow-style mode, as it does nothing in that mode anyway! If you do set it, you get Warsow and CPMA air control added!

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@8952 d7cf8633-e32d-0410-b094-e92efae38249