[script][buff] Add charge arg

[Raykyn55]

Adds optional 'charge' arg to buff for warrior mages who use elemental weapons. This can be triggered via the argument, or a yaml setting:

buff_max_elemental_charge: true

Allows standalone max of your charge with ;buff charge only(or really any word that isn't a waggle_set), complementary chargeup AFTER buffing with ;buff charge, or ;buff <waggle_set> charge. Finally, if the yaml is set, tacks on a max chargeup at the end of any use of buff script.

[Dartellum]

I thought a public script existed for this already. I believe one is in ;repos.