Fix Issue #2
* Updated REGEX to allow all lowercase and uppercase characters which allows for cross-language (for the most part) support
* Updated REGEX to allow for the _ character
This commit fixes Issue #1:
* Issue #1 was caused by the app trying to modify a registry entry when making a new RemoteApp.
* As the registry entry does not exist due to the RemoteApp being new, the modify failed.
* Fix was to not attempt a rename on New RemoteApp creation from Advanced window.