Allowance of all -commands, -bxt-commands and bxt_trigger_setcommand

Rule change: All the -commands (normal HL-base-commands with a "-" at the beginning, and all -bxt-commands) as well as bxt_trigger_setcommand (still banned in individual levels) are allowed in runs.

We have discussed whether some commands that are currently disallowed should or should not be allowed. We have decided to allow the -commands since they do not affect the run. Usage of bxt_trigger_setcommand is still banned in Individual Level runs, since custom triggers for timing might be installed for IL-timing in the future.