V1.2.0 Qt Interface Migration, Bugfixes, Nuitka Build

250724-1441

• set Version to 1.2.0
• Bugfixes: mainly fix for delays not working
• complete migratation of existing gui to Qt6 (PySide6)
• Nuitka (C compile) Build Process (faster execution and smaller program size)

What's Changed

• V1.2.0 merge from main testing branch by @wasiejen in #72

Full Changelog: v1.1.5...v1.2.0