* Fix: editing function definition could create a recursive structure resulting in an IDE crash
* Fix: CPX Simon game sound not working
* Fix: bug in "find" for ByteArrays
* Fix: make "say" block handle ByteArrays
* Update esptool.exe URL in build script
* Force to use of python3 for esptool in linux
* Re-enable user preferences for Mac OS (previously disabled to work around a Catalina issue)
* Allow ByteArrays to be parsed as numbers (like strings)
* Prevent file primitives from reading, writing or listing the ublockscode system file
* Print missing primitive name when an unimplemented primitive is encountered
* Remove SimLight example for obsolete IOT-Bus board
* Replace TempAndHumidity example with TempAndLight (no DHT sensor needed)
* Generalize the Dice and DynamicPolygons examples to run on M5Stack as well as ED1
* Merge the 'by board' folders for the M5Stack ED1
* Network primitive improvements:
  - Fix: Remove httpClient.flush() (flush() discards unsent data, so this could explain Kathy's issue)
  - Fix: Start the HTTP server the first time it is used and never stop it or it will reject connections
  - Allow HTTP server to receive binary data (to support sound and image data
  - Remove unused stopHTTP and httpClose primitives (not needed)
  - Remove unneeded calls to stopWiFi (now done automatically when you try to connect)
  - Deprecate startHTTP primitive (now a noop; will be removed later)
  - Add CORS header to HTTP server responses
  - Add reporter for HTTP headers
  - Add support for reading the Content-Length header
  - Update WiFi libraries accordingly