big rewrite with a dbus service, not finished atm

TODO

data/applications/pamac-manager.desktop

data/applications/pamac-updater.desktop

data/dbus/org.manjaro.pamac.conf

data/dbus/org.manjaro.pamac.service

data/polkit/org.manjaro.pamac.policy

gui/dialogs.glade

gui/manager.glade

gui/updater.glade

pamac-manager

pamac-update

pamac-updater

pamac/__init__.py

pamac/callbacks.py

pamac/config.py

pamac/manager.py

pamac/pamac-daemon.py

pamac/transaction.py

pamac/tray.py

pamac/updater.py