Interpolation Movement, AttackTimer

Iterpolation
- added interpolation on horizontal movement

When staying still - No Interpolation (interferes with aim offset, but
we can hack it later if need be)

When staying still + attacking, interpolation of 6000 is applied

Movement - When not attacking, interpolation of 12000 is applied (barely
noticable, but if you turn really fast you can see

Movement w/ attack, interpolation of 6000

Next update (~10mins) i'll add console commands to change interpolation
rate to mess with it.