Improvements to game scripts

[diamante0018]

• setClientDvars is to be preferred over setClientDvar when there is the need to set more than one client dvar. The reason is that only one server command is sent instead of multiples. That may cause issues, especially when other game scripts are causing other server commands to be sent. In short, the fewer server commands are sent the better.
• getDvarInt is to be preferred over int( getDvar() ). The reason is that getDvarInt already fully supports casting variables to the desired type internally. The second int() is redundant. Additionally, the IW variant of getDvarInt supports a default value that is returned in case the dvar was not registered or other errors were to arise when calling getDvarInt. This can't be done with a regular getDvar.
• getTime() always returns an integer type and self.lastAttackTime is always assigned an integer type therefore the casting to int before subtraction is redundant as well.