Add $rpc->rpc()->add_timer(); and ->del_timer()

Add $rpc->rpc()->add_timer(); and ->del_timer()

Add a timer. Requires UnrealIRCd 6.1.0+
@param timer_id         Name of the timer (so you can .del_timer later)
@param every_msec       Every -this- milliseconds the command must be executed
@param method           The JSON-RPC method to execute (lowlevel name, eg "stats.get")
@param params           Parameters to the JSON-RPC call that will be executed, can be NULL
@param id               Set JSON-RPC id to be used in the timer, leave NULL for auto id.
@return stdClass|array|bool

Example usage would be:
$rpc->rpc()->add_timer("timer", 1000, "stats.get");