Improve test suite
Add semantic highlighting for by-name parameters at call site

Fixes #1000989
Add quick assists for spelling mistakes

After the creation of our own quick assists the Java spelling mistake
quick assists were no longer called. This adds some adapters, which
provide the necessary clutter to call Java quick assists.

Fixes #1002301
Remove `o.s.u.ui.SWTUtils`

This is a duplicate of `o.s.u.eclipse.SWTUtils`.

Fixes #1002288
Merge pull request #855 from sschaef/t1002301-spelling-corrections-quick-assists

Add quick assists for spelling mistakes
Merge pull request #856 from sschaef/t1002288-remove-swtutils

Remove `o.s.u.ui.SWTUtils`
Merge pull request #847 from mlangc/highlight-by-name-parameters-1000989

Highlight by name parameters at call site (#1000989)