This is the last change of the `backend_refactor` branch. This makes
`RareCore` the centerpiece of Rare by moving initialization before the UI
is brought up. RareCore is now in control of creating and querying `RareGame`
objects, re-introducing the ability (incomplete) to refresh the games library.
As a result, ApiResults has been removed.
Signed-off-by: loathingKernel <142770+loathingKernel@users.noreply.github.com>