Misc AIR improvements

Regarding the FB import changes: there seems to be a problem with FDBuild, when it compiles Debug projects, it obeys the output path, which is usually bin-debug, but when it's a Release project, it seems to enforce bin. I tried to look for the cause of the problem, but I didn't find anything of interest. If nobody else looks for it, I'll do again when I look into improving this a bit more in some time.

Also, I don't know why this PR includes 42 commits, instead of the 3 really of interest, but I guess it won't affect anything? 
When I saw the supported versions part I thought of refactoring it, I normally dislike those large blocks of code full of if-else if conditions, but didn't want to spend much on it, and left if for a later time, as I'll make more changes to the AirProperties plugin.

Will look at PlatformData.SupportedLanguages when the time comes, thank you.