There seems to be no point in waiting to do this check, so do it as
early as possible. This also makes the first function to only do the
update and consolidates all the auxiliary stuff into the second
function.

Online mod list is currently updated on the background every 5 minutes.
Ideally downloading and processing the mod list wouldn't take that long
that the interval would fire before an earlier round has finished, but
the most popular games have so many mods that on people with slower
connections this seems to happen. Multiple connections then compete for
the same download bandwidth, making the process even slower.

Users can trigger updating the online mod list from the settings view.
Use the status text to show if an update is already in progress and
prevent user actions from triggering another one, since they would just
compete for the same bandwidth and slow down the manager.