Allow wildcards in callsign triggers

Unfortunately wildcards don’t work well with the current architecture of the matching engine (which relies heavily on optimization wth hash tables, binary search etc.) to efficiently match the high number of spots against the high number of triggers.

However, if the number of relevant callsigns is relatively small (say, < 1000), you can list them all in one trigger (Callsign condition => click the “List” button), and it won’t hurt the system performance any bit.