Feature request: "infix move"

[klayoutmatthias]

• basic implementation
• find a solution for the Undo issue with "paste interactive" / "dup interactive"

This is a variant of the move command which immediately starts a move on the selection.

See https://www.klayout.de/forum/discussion/1283/text-size-selectability-and-moving for the discussion.

[klayoutmatthias]

See issue-317 branch for first implementation. See commit comments on 70a4ce8 for open topics.

[klayoutmatthias]

Feature is implemented.