Packaged plasma-framework, first part of Plasma Mobile

Created by: PureTryOut

This is the first part for #161 (closed).

APKBUILDs are all converted from Arch. I've minimized the dependencies to only what they need to compile. Please check for any style changes that are preferred, or some Arch-specific variables that I've missed. To test compiling these packages, run ./pmbootstrap.py build plasma-framework. I recommend against building on a different architecture than your host machine right now due to #209 (closed).

Note that although Phonon is in the Alpine repos already, it misses Qt5 support. The version in this PR builds it with that feature (the -DPHONON_BUILD_PHONON4QT5=ON line).

The source of polkit-qt5 is included due too no tarball being available anywhere and APKBUILD not supporting a Git helper. Should probably be uploaded to https://dev.alpinelinux.org once we start upstreaming.