I added ellipses so it matches the other loading placeholder we have. I
also removed the spacing in it's layout, because there is more than
enough space inside of BusyIndicator itself that it makes the
additional spacing look odd.
Separate out a base `MessageContentModel` that can be extended to get the component types from different places. This is used currently for `EventMessageContentModel` but will be used later as part of the rich chat bar.
All display text is now in the text component so it never needs special casing. This also cleans up some of the model parameters so more things come from attributes including location and file data (which was already a qvariantmap anyway).
Also cleaned up the itinerary and file enhancement views,
There is no need for NeochatConnection to depend on ThreePIdModel and also this means it's not in memory when not needed.
Also a little cleanup to make sure only a single job can run at a time.
Since _ls is now deprecated this is removed in favour of L1, I've also taken the oportunity to replace QStringLiteral and QLatin1String with their shortened form while we're at it.
There are also a few instances where the string literal type has been switch, the general rule being to use the one that matches the function type or value being compared to avoid conversions.
Turns out trying to manage pointers in the model is a bad idea so only save eventId in MessageContentModel, events pointers will now only be obtained temporarily then discarded to avoid both creating additional copies of the event in the model and potential sources of crashes.
This also creates a basic unit test that we can add to going forward.
