refactor: Application code updated to NativeScript 4

[NickIliev]

• [x] Version bump
• [x] Migrate to NativeScript 4.0 structure
• [x] Use the split UI plugins (nativescript-ui-listview, etc.)
• [x] Remove Telerik Analytics (Platform has been closed and the plugin + the related code is obsolete)
• [x] Webpack enabled build with -common CSS files being imported with the Webpack rules
• [x] App ready for publishing for both iOS and Android

Note: The current state might need some additional changes depending on https://github.com/NativeScript/nativescript-dev-webpack/issues/545