Replaced one unclickable TaskView JList with 4 separate working ones

requested review from @xdipcar, @xfuchsov, and @xvlcek4

added 13 commits

• 5beb69c1...14d0c214 - 8 commits from branch milestone-01
• 9f6ea271 - Replaced one unclickable TaskView JList with 4 separate working ones
• c7e88780 - Moved panel-extending classes into new panel package
• 0bc187e4 - Fixed possible NPE
• b033663d - Extracted enum toString into Utilities for common usage
• 28a48e73 - Enumerized JTabbedPane's tabs for easy adding, without reflection

Compare with previous version

added 5 commits

• 12f800ce - Replaced one unclickable TaskView JList with 4 separate working ones
• 8d2913db - Moved panel-extending classes into new panel package
• 47c66911 - Fixed possible NPE
• fad846d6 - Extracted enum toString into Utilities for common usage
• 22f3a092 - Enumerized JTabbedPane's tabs for easy adding, without reflection

Compare with previous version

added 1 commit

• f992111f - Refactored StatisticsTable into StatisticsView to be on the same level as TaskView

Compare with previous version

added 1 commit

• 94825a40 - Moved classes around to better conform to MVC design

Compare with previous version

added 2 commits

• b1634f67 - Fixed mutable/referential lists being used
• 69a6568d - Removed unused extension and field

Compare with previous version

resolved all threads

approved this merge request

merged

changed milestone to %Milestone01 - Barebone UI