Project to prettify SVG font dialog, fix nagging selection issue and let dialog be narrow.
- Font list moved to "Global settings"
- Fixed font selection that's been constantly cleared by needless dialog updates
- Selecting first font on resource change to make dialog instantly usable (enabled)
- Removed hard-coded sizes for lists and previews
- Reduced minimal width of the dialog
- Modified layout of global settings by lining up widgets in a grid
- Changed preview color to use theme foreground (no more black glyphs on a dark background)
- Adjusted margins and label casing
