Update to Ubuntu Touch 20.04 focal

[jmlich]

I have made changes according to https://docs.ubports.com/es/latest/appdev/guides/port-to-focal.html and telescope seems to be working.

Closes: #63

the git submodule should be updated according to that pull request.
AsteroidOS/asteroidsyncservice#58

[FlorentRevest]

The changes look good to me but do I understand correctly that this PR as-is wouldn't build because it contains a mix of qmake and cmake ? :/ Specifically, https://github.com/AsteroidOS/telescope/blob/master/telescope.pro#L5 would break because of the submodule update.

[jmlich]

You can obviously cherry-pick the patch on top of the qmake branch and then it will work

[jmlich]

I have tried to migrate everything to cmake. However, this change have still some raw edges. Also I am not very comfortable with git modules. I will appreciate if someone else will finish that effort. My main interest is still in Amazfish.
#67