Remove messages from all bindings

[Arcanemagus]

Properly queue up messages for removal, and then remove from all bindings at once. Before this it was possible for a message to be removed from one binding and then get "stuck" in other bindings as it was already marked as removed.

Before this you could get a message "stuck" by:

1. Open a file
2. Trigger a message on the file
3. Split the file so there are two instances open for it
4. Trigger a second, new, message in the file
5. Fix both messages
6. Note that the initial message is still showing for the second view on the file