Speed fixes:

*Added UpdatePlayerSpeed hook.
*If GAMEMODE.Config.norespawn is set, the player's speed now gets set on job change without the need of respawning.
*The correct speed is now given back after unarrest, weapon (and door ram) holster and undrugging.
Merge branch 'speed-fix' of github.com:Bo98/DarkRP
Changed UpdatePlayerSpeed to be called as a hook
This way people can hook into it and define their own player speeds