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
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