...by clarifying the widget hierarchy. Ensure that the combo box at the
top is perceived as the main widget:
* Remove the "Configuration to use:" label so the combo box gets more
horizontal space and thus dominance. Also, rename the group box
header/label from "Clang Diagnostic Warnigns" to "Clang Diagnostic
Configuration".
* Move the command line text edit below the combo box into its own tab
page to clarify the relation to the tidy/clazy tabs.
Change-Id: I97a0785678e33b94746046d07a911422b1469890
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>
