Printrun 2.1.0

Minor release with plenty of GUI enhancements.

New Features

• Switch from dependency appdirs to platformdirs (#1420)
• Support print cancellation on Prusa/Marlin based printers (#1414)
• Build procedure reworked to use a pyproject.toml file (#1407)
• Dropped support for Python 3.7 and added Python 3.11 (#1400, #1406)
  • Removed 'PythonGTK3' submodule
  • Removed dependencies on 'cffi', 'cairocffi' and 'cairosvg'
  • New dependency on 'pillow' for Windows systems
  • Re-enabled support for 32 bits architectures on Windows
• Reworked translations (#1343, #1406)
  • Translation brought up to date to match latest code
  • Translations for all Printrun tools are now within a single file
• Reworked Layer Projector tool (#1387)
• Pronterface user interface enhancements (#1331, #1347, #1367)
• Code refactoring on printcore (#1346)
• Added unit tests suite for printcore (#1334)
• Higher baud rates offered by default (#1267)

Fixed Bugs

• Fix type error quirk in status when printing via SD (#1426)
• Consequences of exiting a print are more transparent (#1415)
• Temp button Off for heater or bed conversion error (#1406)
• Pronterface double-listing filaments for upper and lower case types (#1406)
• Pronterface keyboard shortcuts prevent inputs of some characters (#1406)
• Typo in pronsole desktop file (#1359)
• Line number mismatch on resend (#1341)
• Module 'pyreadline' replaced by 'pyreadline3' (#1332)

Administrative

• Updated instructions to build the package (#1400)
• Reworked README (#1309, #1374)