Nuke Fody and fix up some other stuff

This PR removes Fody ModuleInitializer from the build - it was super rad, but we had two major problems with it: (/cc @simoncropp who might want to poke at it)

* If you enable "Link All" in a Xamarin.iOS/Android project, ModuleInitlalizer breaks the build
* WinRT builds would include "FodyWeavers.xml" in the AppX output, which breaks erry'thing.

This PR also fixes the sloppy build mistakes I introduced in previous PRs and does some other csproj'y stuff