docs(Examples): refactor SourceManager, add toggle for languages (#650)

* docs(Examples): separate contexts, use sources to render dedicated examples

* docs(Examples): refactor SourceManager, add toggle for languages

* wip

* complete TODOs

* fix broken code after merge

* style improvements

* add changelog entries

* move to correct CHANGELOG section

* use shorthand api as default

* rename constant

* disable edit to JS examples

* rename to renderSourceCode

Author: layershifter

CHANGELOG.md

@@ -27,6 +27,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Fix positioning of `Popup` with changable content @layershifter ([#678](https://github.com/stardust-ui/react/pull/678))
 - Fix default props in `Accordion` and `Dropdown` components @layershifter ([#675](https://github.com/stardust-ui/react/pull/675))
 
+### Documentation
+- Add ability to edit examples' code in JavaScript and TypeScript @layershifter ([#650](https://github.com/stardust-ui/react/pull/650))
+- Fix broken switch to Children API when an example is not present @layershifter ([#650](https://github.com/stardust-ui/react/pull/650))
+
 <!--------------------------------[ v0.16.0 ]------------------------------- -->
 ## [v0.16.0](https://github.com/stardust-ui/react/tree/v0.16.0) (2019-01-07)
 [Compare changes](https://github.com/stardust-ui/react/compare/v0.15.0...v0.16.0)