Fixed behavior of mid-button vertex selector, add ability to all-replace and relative moving to replace coords

Added ability to snap to pre-existing vertices while drawing, added changelog

Fixed: Coordinates weren't drawn properly on a bright background (was always drawn in bright colors..). Note that previous commits were left dangling in their own head, the string class changes broke too many things.

Removed the Configure button from the LDraw path config dialog, it's no longer needed

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mercurial