mom_replay_recording_start/stop and mom_replay_play qol

[granis48]

What feature is your improvement idea related to?

1. mom_replay_record_start just starts a replay recording with no feedback on whether it's doing anything or not.
2. mom_replay_record_stop asks you do enter a filename for the replay, this is something I'd expect in the _start command rather than the _stop command. This also doesn't give you any response whether it worked or not.
3. The filename you enter after mom_replay_record_stop needs the .mrf suffix even though this is not communicated to the player.
4. mom_replay_play does not autocomplete for any subfolders, you can manually enter manual/test to open a manually made replay but this is not ideal.

Describe the solution you'd like

1. Give the player a response no matter what. Just something like "Started recording a replay..."
2. Make the player enter the filename after the mom_replay_record_start command rather than the _stop one, this makes more sense since that's how the demo record command works.
3. Make the .mrf file extension automatically added after the players' filename input, or at least specify that it needs the extension when trying to enter the command.
4. Make mom_replay_play account for subfolders. If i type in "test" I want it to find the ´manual/testreplay´ file