[ci] drop obsolete / broken builds & fix WindowsStore SDK selection

[Rechi]

@garbear this is the CI fix PR for Omega you've asked in #79.

[garbear]

So I just delete travis, appveyor and GH Actions, and Azure is fine for Piers? That's great, but doesn't leave us with non-windows coverage outside of Jenkins. Yet I have no complaints.

[Rechi]

Travis and appveyor aren't enabled so those can be removed.

GH Actions in the current state have to go, as they depend on a working Ubuntu PPA. I'm not sure if all add-ons use this way or valid other build tests.
We could replace the GH Action with the build recipe of travis, to keep a compile test for Linux. Travis didn't require the Ubuntu PPA, it included building the depends from source and not using system libraries.

Azure seems to be fine in the in Piers branch of this repo (uses ARM64 instead of ARM-UWP), at least it reports success.

[Rechi]

GH Actions also needs to be changed or removed in Piers branch as it's also requires Ubuntu PPA.

[Rechi]

@garbear I've added a fixup commit to add GH Actions for Linux.
If this is wanted I'll squash the commit.

[garbear]

I think it looks good. I can still take care of the rest of the addons when i get time.

[Rechi]

IMO this is now ready to go and can be taken as template for other add-on repos' Omega branches.

[garbear]

Thanks! might be a few days to a week before I sync sync all the CI

[Rechi]

Attention, screensaver and visualization addons need an additional step in GH Actions to install libgl-dev.

[garbear]

All CI for xbmc org addons should be good on both omega and piers branches

[garbear]

The following failed for GH Actions build CI:

• Translations update from Kodi Weblate audioencoder.lame#84
• Translations update from Kodi Weblate visualization.milkdrop#77
• Translations update from Kodi Weblate visualization.milkdrop2#66
• Translations update from Kodi Weblate visualization.projectm#125 (just clang)

[Rechi]

You can see in the Jenkinsfile of milkdrop and milkdrop2 and also at https://github.com/xbmc/repo-binary-addons that those two addons are windows only.

[garbear]

k, removed build.yml from those two on both branches

[garbear]

Windows results: https://dev.azure.com/teamkodi/binary-addons/_build

[garbear]

Nice, green CI for all GH Actions now.

Azure builds:

• https://dev.azure.com/teamkodi/binary-addons/_build
• https://dev.azure.com/teamkodi/kodi-pvr/_build

[garbear]

Should we remove UWP-Win32 from Azure on Piers? We only want Win32/Win64/Arm64/UWP-64 right?