Misc improvements and added tests

• Moved logger in preparation for logging in Scheduler.
• Removed some old Qt5 stuff I found.
• Greatly improved performance of ListScheduler, especially for large schedules.
• Added a bunch of new tests.

added Code quality Enhancement Scheduling Testing labels

assigned to @simbj106

added 1 commit

• 3189fe94 - greatly improved speed of ListScheduler and added more tests

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