3d window toolbar fixes (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#55800
Author: @uclaros
QGIS version: 3.36

3d window toolbar fixes

PR Description:

Description

This PR takes care of the big list of unrelated shortcut actions that have accumulated over time on the configure... button in 3d views. The Configure... button started as a menu container to mimic the 2d view window behavior, however the 3d view now has a dedicated Configuration dialog.
My suggestion here is:

• Let the Configure... button directly open the config dialog (one less click to access the deeper settings)
• Keep the previous shortcuts in separate menu buttons, grouped by content:
  • Camera
    
  • Effects
    
• Also group Save as Image and Export 3D scene into an Export button

This PR also registers a keyboard shortcut Ctrl+Shift+E for the Set 3D Scene Extent on 2D Map View tool

Last, it fixes a long standing issue where the 3d window's toolbar items would not appear on the show more double arrow button when they would not fit in the window.

Commits tagged with [need-docs] or [FEATURE]

[uclaros]

Screenshots are not up to date with the final PR, the effects icon has been updated.