Jean-Marc Lasgouttes 593bfe248a Substack should not be allowed to change columns
Disable the arguments append-column and delete-column of tabular-features.

The code is taken from InsetMathCases, with some changes
* no need to record undo here
* in dispatch, return is prefered to break, since we do not want to invoke
  InsetMathGrid::doDispatch.
Propagate these changes to InsetMathCases.

Cleanup of the InsetMathCases error messages to fit with other parts
of the code.

The handling of tabular-features in mathed needs to be unified somehow.

Based on a commit from lynx <lorenzobertini97@gmail.com>

Part of bug #12590.
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Inset 'Xyz' is implemented by 'MathXyzInset' in 'math_xyzinset.[hC]'


Inset hierarchy:

                                   MathInset
                                (abstract base)

                         /            |               \

              Dim                  Char               Symbol, Space, ...
         (thing that need       (for things formerly
          the width_/ascent_     known as characters)
          /descent_ cache)

          /             \

       Nest              Dots,  Func, ...
  (for thing with
   nested content)

        |         \

      Grid        Decoration   Delim   Frac  Macro  Root  Script  Sqrt

      /   \

 Array    Hull
         (base for eqnarray/align/...)