tag v2.0 (and temporary CI changes for artifacts)

build: update OBS things

[build] OBS file updates for v1.3

Also add GCC 9 and 9 tests/exports

OBS changes for v1.2

[windows] [build] Fix (maybe) #279

Attempt to fix issues with new vcpkg-based deployment (AppVeyor)

(revert me after build) appveyor: Use CEMU_VERSION

TODO: Find a better way to make tag/releases builds :P