[rtmandreyev]

Add the Construct extension (1.1.1)

Construct draws a NetLogo run as a construct: an animated 3D hologram in which height is time, built from the
recording alone. construct:run runs, records and draws a model in one command; the commands one by one
(construct:start, construct:track-turtles, construct:track-reporter, construct:track-patches,
construct:record, construct:draw) give full control. construct:draw can also write a 3D model (glTF,
"model" true) and, with Blender, a film ("film" true).

• Java, NetLogo Extension API 7.0, compiled against NetLogo 7.0.4; Apache-2.0.
• Tested headless in NetLogo 7.0.4 and on stock models (Virus on a Network, Wolf Sheep Predation, Fire, Flocking):
  the recording matches, tick by tick, the include-file recorder Construct has shipped since 0.3, and its errors say
  what to do. NetLogo 3D runs are recorded with their heights.
• Platforms: recording is plain Java. Drawing runs Python 3.10 or newer (python3; python on Windows) with the
  construct compiler bundled in the zip: no network, no packages to install. Without Python, recording still works
  and the error says how to point the extension at one (construct:set-python). Tested on macOS, and headless on
  Windows and Linux in CI (GitHub Actions, NetLogo 7.0.4: the zip built and unzipped beside a model, a run recorded and
  drawn): https://github.com/rtmandreyev/construct/actions/workflows/tests.yml
• Source and docs: https://github.com/rtmandreyev/construct/tree/main/hosts/netlogo