Synapse issues wish list

Here is a list of issues on Synapse project that Element Android (and probably other clients) is expecting to be fixed.

## P1

- https://github.com/matrix-org/synapse/issues/1297
- https://github.com/matrix-org/synapse/issues/8686

## P2

- https://github.com/matrix-org/synapse/issues/10937
- https://github.com/matrix-org/synapse/issues/10484
- https://github.com/matrix-org/synapse/issues/8137

## P3

- https://github.com/matrix-org/synapse/issues/9392
- https://github.com/matrix-org/synapse/issues/8218
- https://github.com/matrix-org/synapse/issues/8136
- https://github.com/matrix-org/synapse/issues/13128

## Will require some extra work

- https://github.com/matrix-org/synapse/issues/7676

Feel free to edit and update the list!