Improve chunk editing (also for fixed floor editor?)

[theCapypara]

hej hej, i was thinking in regards to the chunks when editing scenes. it'd alleviate some work if users would be able to right click a chunk on the scene, and the program would select that chunk to be used. this helps to identify easier which chunk it is, and to place it down more quickly if you are editing/moving things around also if you could select more than 1 chunk at a time, it'd reduce the time you have to pick 1 chunk, go place it down, go back, and forth.

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Beep, boop, I'm a bot! This issue was created by @Tainted in #beta-tester.