Changes:
- `ShowDevelopmentWarning` is now under the '[Interface]' group in
Dolphin.ini, with other interface-related settings. So, whoever uses
DolphinQt will have to edit that manually again. Sorry!
- Game search paths and the last file are now shared properly with
DolphinWX
- Qt-only preferences like "Preferred View: list/table" are now
stored using the platform's native settings storage, rather than in
UI.ini
FormLayout is not intended for this sort of dialog:
> QFormLayout is a convenience layout class that lays out its children
> in a two-column form. The left column consists of labels and the right
> column consists of "field" widgets (line editors, spin boxes, etc.).
