Update to 2021.01, ok reinoud@

Main changes since 2019.05:
The big language change is the introduction of function literals but there are
a number of other useful changes too, like the new exponent operator (^) and
much better and more general support for tail recursion optimization.

The GUI and especially the Editor has seen a huge amount of new features.
Most visible is probably the auto-complete which can propose built-in
functions and modules.

Another much anticipated feature is the "jump to code" from the 3d preview.
While it's not possible to go into the deepest levels of the design in all
cases, it's a great tool to navigate designs.

But it's worth highlighting also some of the not so obvious smaller features
which might improve the editing workflow.

    » Bookmarks - Ctrl+F2 to toogle bookmarks, F2 / Shift+F2 for jumping to
      next/previous bookmark.
    » Changing numbers via mouse - Similar to ALT+Cursor-Up/Down, numbers can
      be modified by placing the cursor at the number and using the mouse
      scroll wheel while pressing the ALT key.
    » Code snippets - Insert often used code snippets using ALT+Insert or via
      editor context menu, custom templates can be added as simple files.

for a complete list of changes see
http://www.openscad.org/news.html#20210131

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