This adds a new IntentService to pre-process Intents that request a
new repo is added. Right now, this only handles Intents that come
from the new storage scanners.
This also adds a new case to the AddRepo UI logic to cover when an
incoming Intent is for a mirror that is already included in an enabled
repo. In that case, the user is show the Repo Details screen for the
repo that includes that mirror. This is done is a hacky way right now
since the only path through is to click the button. So this clicks
the button in code.
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