* Handle most recently used search/replace strings within settings.
* Check for last modified time of json file and reload it if needed.
* Handle changes in MRU search / replace lists size.
* Improve handling of changes in MRU list size.
* Don't check for last modified time in every getter method. Load only when starting application.
* Add const identifier to getter methods.
* Address PR comments: Add const to reg and json file paths and set them in constructor initializer. Check pushIdx validity. Move implementation to cpp of PowerRenameUI constructor.
* Add error checking when getting values from registry.
* Use JSON data file for storing PowerRename settings instead of registry
* Address PR comments and made several improvements
* Remove WindowsApp.lib dependencies in test app and unit tests
* Revert changes in vcxproj for unit test
* Solve linker warnings generated while linking WindowsApp.lib
* Don't migrate enabled flag. Always read / write from registry.
