- Bump ECS core to version 0.3.0 (Python 3.11 compatibility)
- Bump pytest, coverage and pytest-cov to most recent versions
- Upgrade package management to Poetry 1.8.2 + related fixes
- Change dependency from Pyside2 v5.15 to Pyside6 v6.4
- Change all Pyside2 imports to Pyside6 ones
- Update Readme about QT6/Pyside6 dependencies and commands to regenerate the GUI base classes from the UI files
- Regenerate the GUI base classes from the UI files
- Rename UI files folder to QT6
- Remove outdated GUI emulator
- Remove all type ignore linked to missing stubs in Pyside2
- Import only necessary classes/namespaces from QtCore
- Change module/class path for enums from main Qt class where necessary (ItemFlag, MatchFlag, TimeSpec)
- Change module/class path for enums from QMessageBox class where necessary (ButtonRole, Icon)
- Fix copy-paste typos in EcaGui::reconnectPartition (self.csca_name => pca_name)
- Use sig_connect/sig_disconnect for all instances of AgentStateUpdateWatcher (fixes a spurious crash/race-condition at ECA GUI close)
- [CI] Switch official version to Python 3.11 (Deb 12) + cleanup other jobs
  - Remove Python 3.7 test
  - Add Python 3.11 test and move coverage to it
  - Change dedicated Debian 10 runner to dedicated Debian 12 one
  - Replace Python 3.9 optional test with 3.12 one