Select and place tiles on the map inside the plugin screen

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(via Indecom ~ GBStudio)

Add the option to copy tiles from one location on the Tile Map to another. It could be:

• Shift + Right Click to select
• Shift + Left Left Down to paint as mouse moves
• Maybe modifiers (Alt, Ctrl?) flipped the painted tile on X and/or Y axis

Would need to add the ability to write the updated layer back out, replacing the contents of the existing layer. That's a little involved since currently:

• Makes a copy of the source image -> merges all layers -> converts everything to 24/32bit RGB -> uses that to show and calculate the map.

• If it was limited to images that only had one layer, or to just writing the output to a new image then it would be easier to implement.