Manipulating value of labels may cause a crash in debug mode.

[boutinb]

Fixes https://github.com/jasp-stats/INTERNAL-jasp/issues/3236
A unit test is added in testdebugdata.

First fix was to add rememberCurrentOrigValDisplay when _labelMapUpdates is called.

But a second fix is necessary:

 The real bug: _labelByValDis keys are built via origValDisplay() which calls processLabel(label, value). For a numeric label whose display equals its value (e.g., _label="6",
  origVal=6), processLabel("6","6") returns "" — so the map key is ("6","").

  But when labelDisplayChanged is later called with previousDisplay="6" (the raw _label), it was constructing oldValDis = ("6","6") — which doesn't exist in the map, failing the
  assert at line 1806.

  The same mismatch existed in labelValDisplayChanged and labelsRemoveByIntsId. Three fixes applied:

  1. labelDisplayChanged:1799 — wrap previousDisplay in Label::processLabel(previousDisplay, origValStr)
  2. labelValDisplayChanged:1822 — wrap previousDisplay in Label::processLabel(previousDisplay, oldOrigValS)
  3. labelsRemoveByIntsId:1159 — replace std::make_pair(label->originalValueAsString(), label->label()) with label->origValDisplay(), which already applies processLabel internally

[JorisGoosen]

Looks like this at least fixes the original crash. Im looking into this a bit more to see if I can add some more tests for this

[JorisGoosen]

I need to test these changes but my worksystem is now in a state of limbo because im recom-piling webengine a bunch, but its crashing now. The dialog really neeeds to be tested and checked still so dont merge