Add freehand polygon-drawing feature

[mfl28]

• Adds freehand polygon-drawing feature including (optional) topology-preserving simplification.
• Adds EditorSettingsPane in settings to set polygon simplification algorithm settings.
• Adds tests.

Closes #24 .

[codecov]

Codecov Report

Merging #25 (9d71b64) into master (01e553d) will increase coverage by 0.08%.
The diff coverage is 86.66%.

@@             Coverage Diff              @@
##             master      #25      +/-   ##
============================================
+ Coverage     84.04%   84.13%   +0.08%     
- Complexity     1213     1281      +68     
============================================
  Files            86       89       +3     
  Lines          5309     5577     +268     
  Branches        477      505      +28     
============================================
+ Hits           4462     4692     +230     
- Misses          612      638      +26     
- Partials        235      247      +12     

Impacted Files	Coverage Δ
...mfl28/boundingboxeditor/controller/Controller.java	72.15% <57.89%> (-0.05%)	⬇️
...om/github/mfl28/boundingboxeditor/ui/MainView.java	77.44% <70.37%> (-0.84%)	⬇️
...oundingboxeditor/ui/BoundingFreehandShapeView.java	74.66% <74.66%> (ø)
...8/boundingboxeditor/ui/WorkspaceSplitPaneView.java	82.07% <84.21%> (-0.08%)	⬇️
.../github/mfl28/boundingboxeditor/ui/EditorView.java	97.29% <88.88%> (-2.71%)	⬇️
...ndingboxeditor/ui/settings/EditorSettingsView.java	91.48% <91.48%> (ø)
...fl28/boundingboxeditor/ui/EditorImagePaneView.java	84.61% <92.75%> (+1.87%)	⬆️
...fl28/boundingboxeditor/ui/BoundingPolygonView.java	84.69% <94.20%> (+0.80%)	⬆️
.../boundingboxeditor/ui/BoundingPolygonTreeItem.java	62.50% <100.00%> (ø)
...l28/boundingboxeditor/ui/EditorSettingsConfig.java	100.00% <100.00%> (ø)
... and 9 more

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

81.1% Coverage
2.9% Duplication