This is to provide some guidance for PRs like: https://github.com/JetBrains/kotlin/pull/1769

Main targets for the fix is completion, parameters info, inlay hints and
override/implement.

Other IDE functions might be affected.

 #KT-24911 Fixed
 #KT-25616 Fixed
 #KT-25622 Fixed

 #KT-24911 Fixed

Refactoring: use KtScript.scriptDefinition instead of KotlinScriptDefinitionProvider.findScriptDefinition if possible

So #KT-22072 Fixed

So #KT-25089 Fixed

Replace ones from org.jetbrains.kotlin package with new annotations from kotlin.annotations.jvm.
No need to copy them to compile kotlin-reflect anymore.
Then simplify reflect project more: no sources — no need to pack its direct output.

 #KT-25733 fixed

Otherwise it's very difficult to view the contents of BindingContext in
debugger views

 #KT-25604: Fixed

Without this class PluginManagerCore.loadDescriptorFromJar fails