ClipPlayer cleanup

[RoiEXLab]

I stumbled across this class and noticed a lot of code is actually redundant or unecessarily complicated, so I decided to simplify it a bit.

I tested my changes with a custom map and custom sound files and it worked fine.

[codecov]

Codecov Report

Merging #8588 (43de4f1) into master (5d6c93a) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #8588      +/-   ##
============================================
+ Coverage     24.90%   24.91%   +0.01%     
+ Complexity     7371     7370       -1     
============================================
  Files          1288     1288              
  Lines         80308    80253      -55     
  Branches      11013    11000      -13     
============================================
- Hits          19999    19998       -1     
+ Misses        58240    58185      -55     
- Partials       2069     2070       +1     

Impacted Files	Coverage Δ	Complexity Δ
...in/java/games/strategy/triplea/ResourceLoader.java	21.78% <0.00%> (+0.82%)	11.00 <0.00> (ø)
...main/java/games/strategy/triplea/ui/UiContext.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...re/src/main/java/org/triplea/sound/ClipPlayer.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...in/java/org/triplea/sound/SoundOptionCheckBox.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../src/main/java/org/triplea/sound/SoundOptions.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...lea/ai/flowfield/influence/InfluenceTerritory.java	96.96% <0.00%> (-3.04%)	13.00% <0.00%> (-1.00%)

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[DanVanAtta]

@RoiEXLab could you check this issue: #7905 for additional test cases. There were some subtle bug fixes in ClipPlayer recently.

[RoiEXLab]

@DanVanAtta Sound is playing fine for Dragon War