1.17+ Support / Java Settings by Instance (#261)

* Patches to get 1.17 working, need to revise into real solutions.

* Add version.jar to cp until 1.17.

* Add server selection button to Java settings tab in preparation for by-instance java settings.

* Java settings by instance

* Use classpath flag instead of hardcode.

* Support 1.19.

* Fix refresh of java exec details.

* Add doc.

* Fix auto download of jdk 17.

* Dependency upgrade.

.eslintrc.json

@@ -5,7 +5,7 @@
     },
     "extends": "eslint:recommended",
     "parserOptions": {
-        "ecmaVersion": 2019,
+        "ecmaVersion": 2021,
         "sourceType": "module"
     },
     "rules": {