build/AddOns, appimage fix, version backport, manifest output

[mcarans]

Add AddOns to debug builds of AppImage
Make Addons in build/AddOns instead of project root
Updated NSIS to look in build/AddOns too
Version fixes backported from prod
Output manifest if packageinfo passed (Linux only)

I extracted a Windows test exe to confirm the AddOns folder is still there with the moving of the AddOns folder from project root to root/build.

[mcarans]

I've now tested snapshot build on Windows with debug console just to make sure

[AnotherCommander]

Just some issues with Oolite.nsi - one of the changes seems to be somewhat problematic and I am suspecting a file character encoding issue. Please have a look at that one. The rest appears to be fine. I tested all three build types and all worked as expected on Windows.

Also noting here that this PR is actually implementing a new feature and not a bug fix. Normally the maintenance branch receives only bugfixes to bugs discovered along the way post-release. However, I believe that due to the nature of this particular feature and the fact that other applications like OoliteStarter will depend on it if we are to go for a 1.92.1 release at some point, an exception can be made for this particular one and we can accept it in the 1.92 maintenance branch.

[mcarans]

@dsalt @AnotherCommander I have fixed the issue with OOlite.nsi and tested a snapshot build on Windows with debug console successfully. Please confirm all is good to merge or go ahead and merge.