Iterate over all fingerprint patterns, fixes #138

[HappyStoic]

Until now, matchKeyValueString and matchMapString iterated over fingerprint patterns in non deterministic order because some parsed fingerprint patterns (for example headers) are parsed into a map type. Since also these functions iterated over patterns until a first match, it could return different version upon each run (described in issue #138).

With this change:

• There is a deterministic behavior because always all patterns are checked.
• There isn't a right way to choose a final version from a list of discovered versions IMO. I decided to use the lowest found because I think that one in theory poses the biggest security risk.
• From a list of found confidences, I choose a maximum value because from my understanding of the rest of the code any non-zero confidence value automatically flags the discovery as valid anyway.