'killed by' and 'respawn' messages in server output

[silvervest]

TL;DR

Output the 'xx was killed by xx' and 'xx respawned' log lines in the headless server stdout

What ?

In multiplayer, when a player is killed by whatever and respawns, those messages are shown in-game to all connected, but are not echoed out to stdout in the headless server runtime.
Having them output similar to how existing join/leave/chat/promote messages are shown would be handy, as that's easily parsable.
I just tested this (accidentally) and found they are not being output in 0.15.13 at least.

Why ?

Should be a pretty simple and minor change, and allow better detail for us post-processing our logs for stats

Thanks!