kcms: follow the HIG a bit more for many checkboxes and buttons

Nate Grahamrequested to merge
work/ngraham/hig-settings into master

Better conform to the HIG in the following ways:

  • Make labels start with a verb
  • Use a raised appearance in list views
  • Use display: AbstractButton.IconOnly to make an icon-only button, and still set the text property
  • Set Accessible.name property for short labels
  • Use attached tooltip for efficiency

@teams/vdg

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