Notes about migration to Java 17

Still pending

OK Neo4 isn't compatible with J17, this prevents a number of tests from working, at the moment Neo4j-related components were disabled from Ondex.
OK The desktop app initiallt showed this error sometimes. It doesn't seem to affect functionality, seems to be fine now.

Notes about migration to Java 11

Still pending

net.sourceforge.ondex.ovtk2.ui.toolbars.MenuGraphSearchBox.fireActionPerformed(), needs getModifiersEx(), keeping the deprecated method until tests.
- The same for some Jung-dependant classes, search for BUTTON1_MASK or BUTTON3_MASK
The workflow-api still depends on an old version of clapper ocutils, see the notes in the POM about replacements to do.