Implement import/export UI
Extract loadStringFromFile() from ImportController
Extract saveStringToFile() from ExportController
Extract app.importAllFromJSON() & .exportAllToJSON() from ui
Move some core modules to core/storage submodule
Introduce exportAll() function to wrap store method
Map arrays.each(), map() and reduce() to lodash implementations
Introduce custom functions.apply() with thisArg as last parameter

Lodash implementation takes thisArg as first parameter, which is not very convenient when applying functions instead of methods.
Map objects.pick() and omit() to lodash implementations
Introduce objects.wrap() to namespace object content
Stub exportAll() and importAll() on storeDouble
Introduce Store#importAll() and exportAll() to import/export all store content
Use Store#importAll() and exportAll() to implement app JSON import/export
Test moka/core/utils/functions.apply()
Test moka/core/utils/objects.wrap()
Fix timezone issue in tests