Fix #5851 and other UI issues from Simon

[Sleet01]

Fixes two issues reported by @SimonLandmine, corrects a style bug that IDEA complains about, and adds one set of client setting controls:

1. Close [0.49.19.1] Default f-key hotkeys for Unit Display tabs in wrong order #5851 : Weapons and Systems tabs in the Unit Display reversed (F5 and F4, respectively)
2. Fixes unfiled bug: Unit Display tab switches to Weapons tab during Weapon Attack phase, but not to Summary tab during Movement phase.
3. Corrects an issue IDEA was bugged by: checking a string's equality to the empty string "" instead of calling .isEmpty()
4. Adds checkboxes in the Autodisplay tab of Client Settings to control the tab switching behavior from 2. above.

Testing:

• Various actions in the UI throughout test games to verify correct behavior of points 1, 2, and 4.
• Ran all 3 projects' unit tests

Note: another issue that had not been filed against 0.49.19.1 (to wit: sub-windows consuming the <CTRL> + <ENTER> key combo) has already been fixed by @SJuliez excellent UI updates.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.97%. Comparing base (a55a508) to head (c03a68c).
Report is 13 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5854      +/-   ##
============================================
- Coverage     28.99%   28.97%   -0.03%     
+ Complexity    13930    13910      -20     
============================================
  Files          2512     2512              
  Lines        267289   267330      +41     
  Branches      47837    47843       +6     
============================================
- Hits          77510    77465      -45     
- Misses       185829   185916      +87     
+ Partials       3950     3949       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[SJuliez]

Looks good.