Missing SonMapEd features

[Clownacy]

• Zooming (Selbi)
• Vertical tile arrangement (MarkeyJester)
• Being able to save the current data in a kind of save-state
• Retaining the current data after shutdown, so that the sprites and whatnot are still loaded when the user next opens the program
• The sprite viewer getting taller when viewing large sprites

[Clownacy]

0a98814 and 3840206 implement states and retaining the current data.

[Pokepunch]

Another missing feature I'd love to see implemented is selecting multiple tiles by dragging the mouse over them while holding down shift. Very useful when deleting tiles.