Reworked Morale Logic

[IllianiCBT]

• Updated morale determination to remove extreme shifts. Now morale will only ever make one step in either direction. The -/+ 2 behavior was a holdover from the AtB Morale system and really should have been removed when morale was reworked a couple months ago.
• Added specific handling of "refused engagement" scenario states. These now count as decisive defeats, as the enemy is completely unopposed and able to achieve their objective with ease.
• Introduced a player-facing morale level for garrison contracts displaying peaceful morale when routed. This will remove any potential confusion resulting from Garrison-type contracts starting with 'routed' morale (working as intended). We set Garrison-type contracts as Routed, so Garrison-type contracts don't feel like you're facing a full-scale planetary invasion from day one. This is a cosmetic change only.
• Removed 'confidence' modifier. This created a poor interaction when there was a large disparity between the skill level of opposing and allied forces and is better handled by the reliability modifier anyway. By removing 'confidence' we place a higher emphasis on victories and defeats.
• Reduced the impact of 'Reliability' modifiers.
• Reduced the impact of 'Performance' modifiers. These modifiers were previously increased to account for the other potential stacking modifiers. That is no longer necessary due to the removal of confidence modifiers and the reduction of reliability modifiers.
• Updated documentation to account for these changes.

Fix #5667

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.03%. Comparing base (be04339) to head (46ca5fe).
Report is 49 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5669   +/-   ##
=========================================
  Coverage     10.02%   10.03%           
- Complexity     6067     6071    +4     
=========================================
  Files          1074     1074           
  Lines        141598   141642   +44     
  Branches      20645    20643    -2     
=========================================
+ Hits          14201    14217   +16     
- Misses       126024   126055   +31     
+ Partials       1373     1370    -3     

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