rename model_api to model.api; add core.api, backend.api and runtime.api
move otp.erlang extras to runtime.api
move RuntimeVersion to runtime package
move rpc and runtimeinfo apis to runtime.api
remove warnings
extract IRpcHelper interface
create rpc_helper extension point
make RpcMonitor api
add Extensionutils.getSingletonProviderExtension
extract IRuntimeCatalog interface
extract dialyzer plugins (not that dialyzer builder is now disabled)