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Readme, changelog and version for release 12.2.1

Mentlicher/backport to122

* Introduce Field & Constant replaces all occurrences in all classes in single .java file - fixed.
* Illegal state exception thrown from CreateOuterClassFix - fixed.

Support ProgressHandle cancel over DAP protocol.

* Request textDocument/codeAction failed when selecting source code for Introduce var refactor - fixed.
* Implementing an interface results in NullPointerException - fixed.
* GeneratorUtils$DuplicateMemberException: Class member already exists form Generate Constructor source action - fixed.
* IllegalStateException from Rename Symbol - fixed.
* GeneratorUtils$DuplicateMemberException: Class member already exists thrown from introduce element hints - fixed.

First attempt add LSP-based rename refactoring to the Java LSP Server and the LSP Client.
Co-authored-by: Matthias Bläsing <mblaesing@doppel-helix.eu>

[NETBEANS-5229] Fixing mapping of jar:file URI to cache and back; disabling ErrorDescriptions in cases when they should be disabled.

[NETBEANS-5229] Fixing mapping of jar:file URI to cache and back; disabling ErrorDescriptions in cases when they should be disabled.

Renaming modified src.java file leads to Cannot save src.java error. Hotfix.

Backport VSNetBeans fixes to 12.2 branch.