ConfigurO 2.8

Fixes

• Header controls on the UWP apps and Apps screens no longer draw over one
  another. The "Include system apps" and "Install after downloading" checkboxes
  painted no background of their own, and the WinForms base class they inherit
  from suppresses the one the framework would otherwise paint, so each left the
  shared drawing buffer holding whatever the neighbouring button had just drawn
  into it -- "Select all" and the Uninstall outline showed through the label.
  The toggles and radio buttons had the same flaw.
• Those two checkboxes now size themselves to their label instead of to a fixed
  width, so translations longer than the English string are no longer cut off
  mid-word. The Apps status line trims against where the controls actually
  start rather than a fixed reservation.