Add feature to sort groups using shortcut keys

[pruthig]

The code changes in this pull requests pertain to issue # 6720 ( Add shortcut keys to sort groups in ascending/descending order )
To realize this functionality, I've added shortcut keys - [Ctrl + Key_UP_ARROW] to sort the groups in descending order and [Ctrl + Key_DOWN_ARROW] to sort in ascending order.

Fixes #6720

Screenshots

When [Ctrl + Key_UP_ARROW] is pressed

When [Ctrl + Key_DOWN_ARROW] is pressed

Testing strategy

I manually tested the changes on my Windows 10 machine.

Type of change

• ✅ New feature (change that adds functionality)

[codecov-commenter]

Codecov Report

Merging #6999 (6ce6499) into develop (cc39f9e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #6999   +/-   ##
========================================
  Coverage    64.58%   64.59%           
========================================
  Files          326      326           
  Lines        40727    40734    +7     
========================================
+ Hits         26303    26309    +6     
- Misses       14424    14425    +1     

Impacted Files	Coverage Δ
src/gui/group/GroupView.cpp	74.23% <100.00%> (+2.00%)	⬆️
src/core/FileWatcher.cpp	85.54% <0.00%> (-1.20%)	⬇️

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[pruthig]

@droidmonkey Hi Jonathan,
Is there some issue with Windows 10? Merge is blocked because of this.

[phoerious]

Windows CI needs some attention, yes.

[droidmonkey]

The unfortunate thing with this change is we can't show the keyboard shortcut on the context menu because then it would make the shortcut an application wide one since that context menu is defined at the MainWindow. I am merging this for now but I think we need to look into a smarter way to handle our context menus.