The class acts as an intermediate between the logger and the function call
It keeps the last message that was sent to the logger. The instance of the
class can be returned as a return value from the LegendaryCLI methods to
provide return status and the message related to it.
The level at which it considers the logged message as an error is configurable.
By default it considers logging.ERROR and above as faulty return values
Lgndr: Move code segments copied from `prepare_download` back to their original location in `install_game`
Lgndr: Add the LgndrLogHandler at initialization instead of every function.
Lgndr: Move `verify_game` to its original place in `LegendaryCLI`
Lgndr: Change the way DLManager is patched into LegendaryCore proper
Shared: Add singleton for LegendaryCLI, LegendaryCoreSignleton returns core from LegendaryCLI
VerifyWorker: Update to use `verify_game` from `LegendaryCLI` directly
PreLaunchThread: Initialize LegendaryCLI to get LegendaryCore from it
InstallDialog: Update `prepare_install` argument names
