Unify Build and Buildv2 parsing into one
Unify Build and Buildv2 parsing into one

Fixes:

* Buildv2 errors
* Buildv2 now checks with ordered_flags like Build
* Build now has more descriptive exceptions like Buildv2

f-droid/fdroidserver,matlink/fdroidserver,fantastico/fdroidserver,matlink/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,fantastico/fdroidserver,matlink/fdroidserver,f-droid/fdroid-server,f-droid/fdroidserver,fdroidtravis/fdroidserver,fantastico/fdroidserver,fantastico/fdroidserver,fdroidtravis/fdroidserver,matlink/fdroidserver,fdroidtravis/fdroidserver,OneEducation/AppUniverse_Server,f-droid/fdroid-server,OneEducation/AppUniverse_Server,f-droid/fdroidserver,OneEducation/AppUniverse_Server,matlink/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,fantastico/fdroidserver,OneEducation/AppUniverse_Server,OneEducation/AppUniverse_Server,f-droid/fdroid-server