This inlcudes slight refactoring and switch to https instead of ftps

Certificate is only on python >= 3.4 verified

added ability to do periodic plugin update checks (every 24 hours) and resized window to fit omemo plugin name properly

PluginInstallerPlugin.fix gtk warning(gdk_window_invalidate_rect_full: assertion `GDK_IS_WINDOW (window)' failed)

create one ConfigParser instance per file so old values ore not used if current manifest has missing fields. Check that manifest file is full