Fixes for atmos stuff - long awaited

Fixes for issues:
#299 - Now mixers work as they should allowing 0%/100% and 100%/0% mixes
#658 - Fixed wording in filters. Now it spells PLASMA properly
#282 & #509 - Fixed inability to unwrench meters. Cleaned the code so it no longer uses Click() and instead uses attack_ functions for its usability.