only force APP_VERSION_MAJOR in modules as necessary

[dromer]

Solves #883

We basically replace the module major version with APP_VERSION_MAJOR.

This then is only a bit confusing for 1.x modules, but at least we have a usable version number again.

[falkTX]

If we want to show the real version this is the wrong way to do it.
Fetch the version first, take the major digit from that version and if < 2 (app-major) force the version. Otherwise leave as-is.

[dromer]

Yeah I wanted to do something like that first, but pulling the major version out was a bit of a pain. I figured that just replacing whatever the first character with our major version would be easier and faster.

We can add an int comparison to it if you think that's better, but it feels more wasteful than just forcing the major version.