Thonny-py5mode

**New features & improvements**

* Add (indeterminate) progress bar to JDK downloader
* Add links to resources (reference and cheatsheet)
* Add color mixer to py5 menu
* Add about window to py5 menu
* Recall last display window location each run
* Specify install_requires version numbers

**Fixes**

* Fix windows run command (that crept in at release 0.4.x)

**New features & improvements**

* Add Thonny 4 support

**Fixes**

* Add Thonny 4 auto-complete
* Remove restart warning error message (caused by `import py5` line)
* Ensure Thonny 4 runs py5 imported mode sketches properly (caused by `import py5` line)

**New features & improvements**

* Switch to JDK 17

**Fixes**

* --