Since the Qt upgrade, Plasma Mobile boots into a black screen, even
on the current version in the master branch. Bhushan recommended we
update to the latest plasma framework anyway (which is possible now
due to the newer Qt version) and try to fix it from there. See #159.
[skip ci].
* Add postmarketos-ui-plasma-mobile
* Add more required packages
* Upgrade plasma sources
* Modernize APKBUILDs
* Make it run in general
* Support RGB32 framebuffer with BGR order (thanks @zhuowei!)