Add API Analysis nature to all plugins

[ptziegler]

This adds the "API Analysis Nature" to all WindowBuilder projects, adds the 2026-03 baseline and converts all JavaDoc annotations to proper PDE annotations.

[github-actions]

Test Results

 2 720 files  ±0   2 720 suites  ±0   10h 54m 58s ⏱️ + 5m 40s
 7 018 tests ±0   6 960 ✅ ±0   58 💤 ±0  0 ❌ ±0 
28 072 runs  ±0  27 830 ✅ ±0  242 💤 ±0  0 ❌ ±0 

Results for commit 080737c. ± Comparison against base commit 9154f15.

♻️ This comment has been updated with latest results.

[ptziegler]

Error:  D:\a\windowbuilder\windowbuilder\org.eclipse.wb.core\src\org\eclipse\wb\internal\core\views\StructureView.java: 
Error:  	/*******************************************************************************
Error:  	^
Error:  The type org.eclipse.pde.api.tools.annotations.NoOverride cannot be resolved. It is indirectly referenced from required type org.eclipse.draw2d.Figure
Error: [ERROR] 1 problem (1 error)

Where does the reference to the Draw2D Figure even come from? And shouldn't the PDE annotations be added automatically to the classpath? And why does it only show up when using the API Analysis nature?

[ptziegler]

I think the issue is the result of different versions of org.eclipse.pde.api.tools.annotations being in the classpath. The latest release on Maven Central is 1.4.0, while the 2026-06 target platform provides 1.4.100.v20260306-2228. Even if they have the same fully-qualified name, they are treated as different types.

This also explains why this issue only shows up for projects where I also use the PDE annotations.

[ptziegler]

I've removed the PDE annotations in WindowBuilder again ad at least locally, the build is successful. More evidence that this is a classloader problem.