Upgrade to JavaFX 19

[mfl28]

• Upgrade to JavaFX 19.
• Update unit test (including combox-subitem selection).

Closes #28 .

[codecov]

Codecov Report

Base: 85.57% // Head: 85.55% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (8a6b0b3) compared to base (5acc75a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #29      +/-   ##
============================================
- Coverage     85.57%   85.55%   -0.02%     
  Complexity     1345     1345              
============================================
  Files            91       91              
  Lines          5600     5600              
  Branches        503      503              
============================================
- Hits           4792     4791       -1     
  Misses          547      547              
- Partials        261      262       +1     

Impacted Files	Coverage Δ
.../boundingboxeditor/ui/ObjectCategoryTableView.java	93.54% <0.00%> (-1.08%)	⬇️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication