SVG font edit fixes and improvements

Mike Kowalskirequested to merge
mkov/inkscape:svg-font-fixes into master

This MR is for small fixes and improvements to SVG font editor.

  1. Glyph edit operation to copy glyph to empty layer
  2. Edit operation to work for fonts without label (created by FontForge)
  3. Add button to set up "typography" canvas taking font dimensions into account
Edited by Mike Kowalski

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