Yet more fixes

Added shared utility functions Player:GetCash and Player:GetBank and
changed everything to use them. Fixed font rendering issues for the
'playeruse' menu. Changed some functions to be hooks instead of gamemode
functions. Removed alpha from team colours. Improved how RP.Team[n]
variables are transferred on team creation. Moved and improved 'police
teamkill' hook/notification. Rewrote !givemoney to not be retarded.