Fixes #4817. CharMap: handle zero-width ModifierSymbol runes without throwing#4818

tig merged 3 commits intov2_developgui-cs/Terminal.Gui:v2_developfrom

copilot/fix-charmap-zero-width-modifiergui-cs/Terminal.Gui:copilot/fix-charmap-zero-width-modifierCopy head branch name to clipboard