add some more default shortcuts

[dterrahe]

And, more importantly maybe, rejigged some of the ways shortcuts and actions are set up internally to make this process less error prone.

Based on discussion on #19407

EDIT: added back the optimisation to not fill comboboxes with their individual items when we are just temporarily initialising iops in order to harvest their actions available to shortcuts.

Also factored out some curve interpolation method combos, so they now have introspection in shortcuts (you can directly trigger a specific item).

Changing to non-draft to get some more feedback on the included default shortcuts

[TurboGit]

Works for me, thanks!

[ralfbrown]

Release notes

UI/UX improvements

• Added new default shortcut keys. These will take effect only if the keys do not yet have user-defined assignments.
  • c - toggle crop box
  • e - set exposure compensation (equivalent to right-clicking on the exposure slider)
  • alt-r - set image rotation (equivalent to right-clicking on the rotation slider)
  • alt-[ and alt-] - fine rotation adjustment

Diederik can chime in on which of the internal improvements should be mentioned, presumably in the "other changes" section.

[dterrahe]

The internal changes are just to make my and your lives easier. Nothing the user would notice.

And some OCD on interpolation methods, for the one lunatic who wanted a shortcut to set a specific value (or, maybe more relevant, set it from Lua). Whoever needs it and is into shortcuts will find it.

But you forgot to mention that Ctrl+, is now also enabled on non-Apple platforms to get Preferences.

And it might be worth reminding those avid readers of the release nodes that

• Enabling Fallbacks (in the shortcuts dialog) will give you e+scroll to directly adjust exposure (and e+horizontal mouse move for fine tuning and e+vertical for big steps) for free.