* End user oriented README.md and dedicated BUILD.md

* Fixing extension description and marking extension as technology preview in package.json.

* Use VS Code instead of VSCode

* User projects are build with netbeans.jdkhome specified JDK

* Updating titles

* Using * instead of 1 as a hyperlink label

* Update README.md

VSNetBeans -> Apache NetBeans Language Server
Co-authored-by: Dusan Balek <dusan.balek@oracle.com>

* A sketch of Java LSP server.

* Moving the java.lsp.server module to a correct place.

* Moving the java.lsp.server module to a new location.

* Support for JDK 9+.

* Upgrading to LSP4J 5.0

* Adding support for code actions.

* Fixing support for keywords in code completion.

* Adding outline.

* Client sends document content on didOpen.

* Cleanup - providing a utility to get the appropriate JavaSource.

* Adding support for go to declaration to the Java LSP server.

* Adding VS Code extension.

* Adjusting dependencies.

* Starting to eliminate remaining usages of old javadoc API and implementation.

* Improving the Java server for the LSP.

* Ensure InstalledFileLocator works by setting cluster path.

* Fixing java/javadoc's Analyzer after drop of usage of the old javadoc API.

* Fixing run with OpenJDK project.

* Resolving forgotten conflicts.

* Automatically add requires.nb.javac when module has a dependency on javacapi.

* Not exporting old javadoc API

* Removing usage of old Javadoc API.

* Adding MarkOccurrences.

* [NETBEANS-2207]: Removing old javadoc api(com.sun.javadoc.**) fron nb-javac

* Re-enabling the nb-javac classpath extensions, as the old javadoc API has been stripped from the nb-javac.

* Fixing dependencies - the language client is a real dependency.

* Ensure nb-javac is not used.

* realpath seems to be unavailable on some systems, using readlink instead.

* Querying source groups sets external source roots, ensuring it is called.

* Using DiagnosticSeverity.Warning for Severity.VERIFIER.

* Produce correct classpath for langtools tests in the current layout.

* Running the Java language server inside module system.

* Attempting to fix verify-libs-and-licenses.

* Cleanup - undoing unnecessary changes; adding license headers.

* More undoing of unnecessary changes

* Correcting clusters list and configuration.

* Adding license info about clusters configuration file (which cannot hold license by itself)

* Avoiding a StackOverflowError in Tree copier when running on JDK 14 by calling the correct superclass method instead of the synthetic bridge.

* Check suitable JDK is available, but show an error to the user if not.

* Adding a rudimentary README.md

* Adding a license header.

Several modules of the netbeans donation can't be distributed by Apache
NetBeans, as they have dependencies, that are not compatible with the
requirements of the ASF. These modules were removed from the build
configuration, but are still spread over the code-base.

This PR moves all such modules to the cotrib subdirectory and thus makes
them easily recognizable.

Licensed 13005 files to Apache, using https://github.com/apache/incubator-netbeans-tools/tree/master/convert.

Equivalent to the content of ApacheNetBeansDonation2.zip with SHA256 being e3069c904d2174c278f91e7551d15830ffcdf5052994052af4ad323e13430f67