This is that bug that causes reply colors to be white, and this error to
print in the log:
qrc:/qt/qml/org/kde/neochat/messagecontent/ReplyComponent.qml:41: TypeError: Cannot read property 'color' of null
The reason why this happens is inside of EventMessageContentModel, it
needs to be able to find the relevant event in the room to fetch the
room member (and then their color.) Dependent on many variables to
align, this can happen easily if you are faster than your server giving
you said events.
But this is an easy fix, we obviously get the event afterwards and just
need to re-evaluate the the author property. I also made sure it falls
back to some color instead of white, which will also quiet the error.
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,
