Add remove all wallpaper button. No we can close all wallpapers and widgets seperate.
Add static function to write an QJsonObject into a file. Truncate is optional.
Change sidebar layout to fix some regressions regarding sidebar type (wallpaper/scene/widget)
Change QML Material Style to dense for smaller desktop controls
Change sidebar content title into the image
Change create wallpaper button to only be active when at least one monitor is selected