community/monado: move from testing

Lots of packages in this MR are maintained by Bradley J Chambers, but they do not seem to have been updated for a while and I can't find a Gitlab account for them. I'll send an email and ask if they are ok with this and if they are planning on maintaining these packages in the future. Bradley Chambers has now made an account, @chambbj, and agreed with both moving over and me taking up maintainership of the packages.

@maribu this moves vtk to community, are you ok with that?

@storedbox this moves libtbb to community, are you ok with that? I tried updating the package to the latest release btw but didn't manage too due to some new incompabilities with Musl introduced upstream (mallinfo usage). Could you take a look at that?

@ddevault this moves OpenHMD to community, are you ok with that? I don't believe you have a VR headset yourself anymore right, do you mind me taking over maintainership of the package?