Allow to replicate already existing groups of tiles

[huderlem]

I just thought about another one, let the user use the Color Picker tool to select an already existing group of tiles inside a map.
For example, holding the left click while the color picker tool is enabled, would allow you to copy X house or tree, and then by changing to the pencil tool and using the left click, you would be able to put as many copies of that house or tree as you want.

This could be particularly useful in some cases, like for example with Professor Birch's Laboratory in Littleroot Town which seems to be a huge pain in the butt to replicate manually.

(originally from yenatch/pretmap#35)

[huderlem]

This has been done for awhile.