Use volatile keys for registering app ID

[ysfchn]

Should fix edge cases such as when AppUserModelId created as volatile : #3 (comment)

[ysfchn]

Just an update for this, winreg (which is a standard/built-in Python library to access Windows Registry) doesn't appear to have required parameters to mark a registry key as volatile, so I'm currently trying to figure out to create registry access methods that manually calls Windows functions with ctypes instead of simply using winreg since it is limited for our case, but will take some time for me to implement it.