This patch implements support for sending locations within threads by following a similar behavior to the other screens: pass the thread root between the various state machine states until the action is finally invoked.
This patch add the `threadRootEventID` as a parameter to media sending functions and forwards the timeline thread root between various application states to the place where its needed.
The 2 missing items are Locations and Polls which currently don't have any support on the Rust side for being sent within threads. That will come in a separate PR.
