Move MissionEditor lua gameside

[sprunk]

ME bundles a bunch of wupgets in mission archives:

• basic bundle, mostly widgets
• these
• these

So every time you touch a file, a mission may turn out to have an override that won't take your change into account and break. Discovering this can be hard and distributing a fix is tedious.

The task is to move all this logic/wupgetry gameside. Caveats:

• campaign has some ME missions (folsom tutorial, kodachi, some tutorials?) which will need to take the change into account
• ME will need to be modified not to distribute those gadgets, to prevent the previous bullet point from reappearing. This probably involves recompiling ME and uploading it to whatever distribution sites exist (I am aware of http://zero-k.info/missioneditor/setup.exe which will likely need infra change or DB access, but maybe there's others? itch.io or something)