Fixed camera choppiness

if (dx == 0 || dy == 0) return;
That || is your problem. That is now &&

Also removed weird center moving thing.
Added fMod installer script for linux, adjusted fMod related settings in Makefile, fixed compiler warnings for modelFunctions
Adding fMod to the QT makefile, too.
Adding the fMod libs for linux. Oops
Adding root perm check for libfmod installation script
Sprucing readme, adding exprtk symbolic math library for particle system