Vertically align icons in context view title+subtitles section

This makes them look a bit nicer. The whole view is now horizontally
centered, rather than the individual labels being horizontally centered.

To do this, the code is changed to use a GridLayout rather than
individual RowLayouts inside a ColumnLayout.
1 job for !161 with aligned-icons in 14 minutes and 40 seconds (queued for 4 minutes and 2 seconds)
detached
Status Job ID Name Coverage
  Build
passed #66167
linux kf5-qt5 qt5.12

00:14:40

86.0%