Loupe 46.beta.1

- Change .desktop file to not include "Slideshow" as keyword
- Change help by regenerating pages
- Change help to correctly represent zoom
- Change to use zbus 4.0

Git-EVTag-v0-SHA512: 8b21165f66201590c5e18e1a528897d9578b7e39e67d057f6d3b1bcba10aea13616abb362404554dd8a299eaf85a01d1d68fe5092e67b9439f2f457de865bada