[MU3] Fixes for the Style and Preferences dialogs

[Jojo-Schmitz]

• Fix tab order in Edit Style dialog
• Fix #312195: Style dialog loses setting of chord symbol radio buttons (replaces and improves @MarcSabatella's PR fix #312195: style dialog loses setting of chord symbol radio buttons #6954)
• Fix #306644: Preferences window doesn't match on a 15'' Laptop screen and height isn't resizeable
• Reducing hight of Preferences dialog further by using grid layouts for the Note Input and Import tabs.
  Also fixing the tab order.
• Reducing height of the Edit Style dialog by reorganizing the Measure part of the dialog.
  Limiting factor now being the the top entry, the Score settings

[Jojo-Schmitz]

With @Tantacrul's official blessing (ff.), this is now how it looks

[Jojo-Schmitz]

Reducing the height of the Preferences dialog even further, by using a grid layout for the Note Input and Import tabs:

[Jojo-Schmitz]

(Slighly) reducing the height of the Edit Style dialog by reorganizing the Measure part:

Limiting factor for further reduction is the Score part:

Esp. the "Indent on first system" had been discussed to get moved to the System part of the dialog, this would help here, but discussion about that hasn't come to a conclusion yet:

[Tantacrul]

Fixes some issues with screens at small sizes.

[Jojo-Schmitz]

Yes, amongst other things

[Jojo-Schmitz]

The vtest fails need #6965

[Jojo-Schmitz]

No idea what or how much of this would apply to master, so I'd rather not port it accross

[vpereverzev]

@Jojo-Schmitz style dialog changes should be OK to port in master (we're using QWidget implementation so far, I can say that it'll be redesigned only in 4.1+)

Preference dialog has a new design in MU4, so it should live in MU3 only

[Jojo-Schmitz]

I see. Will see what I can do, merge conflicts with UI files are very nasty and mostly impossible to fix.

[Jojo-Schmitz]

That edit style dialog has already diverged a lot, none of my changes here seem to make any sense there