Add cmd aliases and update sthelp/ads

[razpbrry]

Adds the following aliases:

• !replayb for !replaybonus
• !replaybpb for !replaybonuspb
• !stop for !stopreplay
• !startpos for !setresp

It also updates the help commands when watching a replay, the commands listed when doing !help/!sthelp and the timed command advertisements.