Properly set object names for install and uninstall buttons in dialogs
Change margins on widgets that are put into scrollareas
Add top margin only on checkable QGroupBox
Remove padding from QToolBox
The `objectName()` of onstall and uninstall buttons should be set
to `InstallButton` and `UninstallButton` respectively for them to
pick up their special CSS properties.
Make QToolBox tab text bold
Clean-up deprecated widget object names in the CSS
