don't use raw english string

Change-Id: I5f34889520afb2149ba480f56d59f14d75ee50c0
extract gamma grid drawing to standalone widget

so the dialog stops scribbling on itself, and instead
uses a real widget for that

This has to be one of our weirdest dialogs, why expend so much effort to create
this dialog for the most obscure of issues.

Change-Id: Ia25e6c67fb278528c6c68a1d6db74de59915fd34
more the png into the .ui so it isn't garbage collected

Change-Id: If0d3829bfc14c602a0167967cbe215782c75f549
scn resource file is empty now post ui-ification

Change-Id: Id8a6d6c4faf3101b13d84de180f8db7cab2cb16f
coverity#735947 Explicit null dereferenced

Change-Id: I8fc9d0eeab6f63be4c815adcbd092d5ff2a96586
coverity#735763 Unchecked dynamic_cast

Change-Id: I4b8a0ebc846ee91530d28821643b3d2f98c0d4f2
coverity#735762 Unchecked dynamic_cast

Change-Id: If5ce403d9a216847532d5a2898e95c9bbde71570
coverity#704831 Dereference after null check

Change-Id: Ia1466b6215c2189395285ba377a18ac27e67b93a