ttf-roboto: Disable the compile task, triggered by the presence of a Makefile that we don't want to use

Adds a recipe for ttf-roboto and makes asteroid-launcher depend on it for the upcoming default watchface

Adds Mer's fork of KCal which is outdated but needed by nemo-qml-plugin-calendar. Should be replaced later on by QtPIM

Adds Mer's fork of KCalCore which is outdated but needed by nemo-qml-plugin-calendar. Should be replaced later on by QtPIM

libaccounts-glib: use --disable-man as reported by kecsap here https://github.com/AsteroidOS/asteroid/issues/6