Fix/perf startup (#417)
Fix/perf startup (#417)

* perf: solves issue at start

* chore: generate unique ids for keep open state

* fix: performance issues

* feat: loading render method

* chore: remove loading

* chore: remove not supported function

* chore: made code shorter
fjmorant/react-native-nested-listview,fjmorant/react-native-nested-listview,fjmorant/react-native-nested-listview