Script type & expression. (SkriptLang#6702)

* Create Script type.

* Support script string/name conversion.

* Script expression.

* Add script lang entry.

* Tests for script expression & names.

* Support all scripts expression.

* Script effects & tests.

* Create dummy Script handle for disabled scripts.

* Script reflection feature flag.

* Restrict literal parsing to commands & parse.

* Test feature flag for resolving name.

* Split ExprScripts by feature to support disabled scripts.

* Fix ExprName tests for new & old behaviour.

* Add tests for disabled script handles.

* Apply suggestions from code review

Co-authored-by: Patrick Miller <apickledwalrus@gmail.com>

* Improve script loading/unloading safety.

* Add feature check for script hotswapping.

* Use expression stream.

* Conformity for file names and proper loading safety.

* Document validity & add condition support.

* Add script is loaded condition + tests.

* Some changes from code review.

* More changes.

* Apply suggestions from code review

Co-authored-by: Patrick Miller <apickledwalrus@gmail.com>

* Clean up EffScriptFile and rename ExprScripts variations.

* Finish code review changes.

* Clean up script loader stuff.

* Fix conflicts.

* Suggested changes.

* Apply suggestions from code review

Co-authored-by: Patrick Miller <apickledwalrus@gmail.com>

* Finished.

---------

Co-authored-by: Patrick Miller <apickledwalrus@gmail.com>
Co-authored-by: sovdee <10354869+sovdeeth@users.noreply.github.com>

src/main/java/ch/njol/skript/config/Config.java

@@ -23,6 +23,7 @@
 import java.util.Set;
 
 import ch.njol.skript.log.SkriptLogger;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;