Redesign dual filter (and enable theme based styling of effect control dialogs) #3093
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Fixes part of #2831
This uses proper layouts and CSS styling from the theme to layout and style the Dual Filter control dialog instead of hardcoded pixel values and pixmaps.
I had to change a relatively large amount of files to enable the styling using the theme/CSS for the plugin/effect control dialogs. I believe passing the parent is the correct way to do it, but please let me know if that's not the case.
P.S. The whitespace seems to a bit messed up, just noticed there's a coding conventions page, I'll fix those up after/when I get some feedback.