Fix relative transformation actions

Martin Owensrequested to merge
doctormo/inkscape:backport-6898-rotate-anchor-keys into 1.4.x

Backport of: !6898 (merged)

This is a regression that happened a long time ago when we moved to actions.

Previously inkscape allowed transforms to be anchored against whichever anchor was being hovered over. Today, we have a click to select UX instead. But this did not carry over to the transformations which are driven through g-actions.

Refactoring:

  • setScaleRelative is renamed scaleRelative to make it consistant with the other transformation relative functions.
  • Action specific functions moved from object-set, to the actions code itself removing a few uses of the desktop object in the object-set.
  • Functions added to get the desired anchor point from the selection easily.
  • Move screen zoom based actions to window actions so we don't have dangling app actions that don't work for the command line.
  • Remove rotate keys from the selection-tool and turn into actions like the scale operators.
  • Allow reading of action key to provide context for anchor memory in rotate.

Fixes #5333 (closed) Fixes #5456 (closed)

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