Improve compatibility with shiremct's Weapon and Item Overhaul & other weapon overhauls

[bstar1million]

Shiremct's new mod [WOTC] Weapon and Item Overhaul (https://steamcommunity.com/sharedfiles/filedetails/?id=2091410349), like RPGO, makes sweeping changes to weapons and weapon attachments, among others. In order to ensure compatibility with RPGO with a minimum of fiddling on the user's side, I propose automatically (partly) disabling RPGO's weapon & attachment changes. This should exclude Suppression on Cannons and Squadsight on Sniper Rifles though, as RPGO does not have other sources for these abilities and shiremct's mod does not provide them either.