Get rid of the default app module!
The scripts from the default app module have been moved into a separate globalCommands module, which is handled explicitly by scriptHandler.
This was done because these commands are not application specific, so it doesn't make sense for all app modules to inherit them.
It also prevents users from breaking NVDA completely due to a broken default app module in their user configuration.
App modules should now inherit from the base appModuleHandler.AppModule.
