Draft: Support for .omwaddon and .omwgame plugins

[poperigby]

Did I screw up the regex here, or is this a problem with libloot not being able to parse the plugin for whatever reason, because I'm getting this error:

Error parsing settings file in "/home/cassidy/Games/Modding/Games/Morrowind/lmm_mods.json".
"/home/cassidy/Games/Morrowind/Data/bound-balance.omwaddon" is not a valid plugin

[limo-app]

The regex works fine. It does not match *.esl files though, do they not exist for OpenMW?. Looks like this is an issue with libloot.
Not sure what the best course of action would be here. I could simply disable auto-sorting and only enable viewing conflicts when the plugin is a standard Bethesda one. This way libloot would not have to load everything that the deployer treats as a plugin.

[poperigby]

Yeah OpenMW doesn't support .esl files. They're not even necessary because OpenMW supports up to 2,147,483,646 loaded plugins.

I think filing an issue upstream with libloot might be a good idea?