TTT: Fix many prediction issues (BREAKING CHANGES) (#1387) Fixes and improvements to prediction of movement, ironsights, shots, etc. * Player:SetSpeed() is removed, use TTTPlayerSpeedModifier hook instead * TTTPlayerSpeed server hook removed * TTTPlayerSpeedModifier hook added, works the same as TTTPlayerSpeed did but *must* be hooked on both client and server * SWEPs that use Think must now call their BaseClass.Think(self) for iron sights to work properly