Add KMbox and update MTP stack
* Makefile.am (EXTRA_DIST): Remove obsolete patch: * patches-appimage/mimetreeparser/ 0001-Use-GpgmeppConfig-instead-of-FindGpgme.patch: Removed * packages/gen-tarball.sh: Switch our active branches to kf5 * packages/packages.common (mimetreeparser, libkleo, kleopatra): Update. (kmime): New. (gpgol): Switch to beta for now. * src/Makefile.am, src/appimage/Makefile.am, src/config.nsi.in, packages/packages.common: Add KMBox * src/appimage/rsync-filters/kmbox.rsync-filter: New. * src/inst-sections.nsi: Add install dependency for KMBox. * src/inst-kmbox.nsi, src/uninst-kmbox.nsi: New. * src/Makefile.am (EXTRA_DIST): Add new nsis files.