This PR allows for some testing until we've decided it is a good time to merge; when rascal-core is stable.

1. The refactorig was automated fully bylang::rascal::upgrade::UpgradeAnnotationsToKeywordParameters
2. Usedreport from this module first to see what the relevance and impact would be
3. No manual changes were necessary but some additional documentation (deprecation) lines were added as by-catch.

This change impactsall projects with code that usesTree.\@loc; so that's a lot. It makes sense to document how to use the automated refactoring or to link this into a UI feature (lenses?) for easy-of-use.

This branch doesnot remove the old feature yet for two reasons:

1. that would break the code that has not migrated yet, and people would not be able to run their tests before and after the upgrade easily. However, it is unknown how code that usesTree@\loc works against a definition ofTree(loc src=|unknown:///|)! So everybody will have to runupdate(myProjectSourceFolder) anyway.
2. at least the synax definition is still required to be able to execute the refactoring.

Commits:

• borrowed upgrade folder from no-more-annotations branch to reuse refactoring code
• ran update function on Assignment test module
• rewrote the annotation tests using the update refactoring
• automatically refactored all declarations and uses of annotations
• folded src kw parameter into the primary definition of Tree
• added deprecation messages of old annotations/keyword parameters thatonly work for Eclipse. We can upgrade Eclipse to also use util::IDEServices and util::LanguageServer, or we can drop them as soon as we drop Eclipse