* Mark methods static and replace Count() with Length
* Use IsNullOrEmpty for null string checks
* Remove redundant initializations to default values
* Use nameof(property name) in place of string literals
* Add NativeMethods class
* Rename property getters in KeysDataModel & AppSpecificKeysDataModel
* Remove underscores from method names
* Mark Helper class static
* Address comments & typo fixes
* Add EncoderGuid property and fix failing build
* Update binding in GeneralPages.xaml
