Added "PlayerSelectChar" hook.

"PlayerSelectChar" returns the player, their character's UID and the
character table.
Returning a boolean (shouldload) and a string (errormessage) allows you
to restrict a character from being selected by returning false and a
string can be returned too.
example:
return false, "This character is banned"

Changed "HL2RP Arresting" to "Arresting Utilities"