Application version fields have been replaced with OS version

[g4r37h]

I can see that in a few recent commits, you guys have made changes to move away from deprecated API calls. However, in doing so, you've actually replaced calls that previously returned the application version with calls that return the OS version. This affects av, dosv and vr event fields.

For instance:

av: appInfo.GetVersion()

Has been replaced with:

osVersion = deviceInfo.GetOSVersion()
av: osVersion["major"] + "." + osVersion["minor"]

https://developer.roku.com/en-gb/docs/references/brightscript/interfaces/ifappinfo.md#getversion-as-string
https://developer.roku.com/en-gb/docs/references/brightscript/interfaces/ifdeviceinfo.md