- split the rectangle ability out of the draw mode into its own edit mode

- changed `&&` and `||` operators to their named variants `and` and `or`

- part downloader: update the input widget with the corrected part name when guesswork is done

- initialize History as not ignoring or history will not work at all with new files

- altered the non-release version string format

- fixed incorrect conversions of weak pointers to strong ones

- reimplemented vertex tracking using a method similar to what the GL compiler uses

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mercurial