As per fdo#37559, it seems exporting filled polygons consisting
of exactly one point (which should in theory be invisible) is a bad
idea for several pdf viewers. Filtering drawing layer output
accordingly.

Detected by the debug C runtime (when using --enable-dbgutil) when
running a unit test.

we need to update range names/database ranges when we copy/paste formula
cells otherwise the ScNameToken may point to a different entry

* mark correct segments as removed / not removed
* move remaining segments with the correct number of entries
* preserve broadcasters and don't delete/overwrite cell entries in that case
* fixes also undo/redo where cells didn't appear after redo
* fixes also weird or invisible values after input on deleted cells

Instead that, use std::basic_string.

mpBitmapEx member is unused after this too, remove.