Update ServerModel to return 'PlayerName' instead of String

[DanVanAtta]

Refactor change to return strongly typed 'PlayerName' object
instead of a simple string.

Functional Changes

[] New map or map update
[] New Feature
[] Feature update or enhancement
[] Feature Removal
[x] Code Cleanup or refactor
[] Configuration Change
[] Bug fix:
[] Other:

Testing

[x] No manual testing done
[] Manually tested

[codecov-io]

Codecov Report

Merging #5335 into master will not change coverage.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #5335   +/-   ##
=========================================
  Coverage     24.18%   24.18%           
  Complexity     6755     6755           
=========================================
  Files          1013     1013           
  Lines         77226    77226           
  Branches      11496    11496           
=========================================
  Hits          18674    18674           
  Misses        56419    56419           
  Partials       2133     2133

Impacted Files	Coverage Δ	Complexity Δ
...egy/engine/framework/startup/ui/ServerOptions.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...va/games/strategy/engine/framework/GameRunner.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ames/strategy/engine/lobby/client/LobbyClient.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ategy/engine/framework/startup/mc/ServerModel.java	0% <0%> (ø)	0 <0> (ø)	⬇️

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