VRSpace.org

Technological upgrade of the server:
- spring boot 2 to latest 3
- latest neo4j 4
- latest openvidu 2

Major consequence of this upgrade is that the server will not run on java 11 any longer, java 17 is required.
Since usual java 17 sausage (*) needs to be added java arguments, simple startup scripts run.sh and run.bat are added to server/bin directory.
Readme and Wiki page are updated to reflect this change.

*) sausage:
--add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.nio=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.util.concurrent=ALL-UNNAMED --add-opens java.base/sun.net.www.protocol.http=ALL-UNNAMED --add-opens java.base/sun.nio.ch=ALL-UNNAMED