JS parser minor: moved isEndOfLine method to Utils
JS backend: report parser errors and warnings
JS parser: fixed JsInvocation mapping
JS parser: removed unused decompilation info
JS parser: removed unused classes and methods
~~ changed error reporting
JS parser: removed RESERVED token type
JS parser: use map for keyword search
~~ rewritten CallResolverExtensionProvider in kotlin
~~ Status result assertion
~~ use one trace for frontend and backend diagnostic reporting