Eliminate sscanf usage in Archivers

[soakbot]

Teknomancer
Reason: sscanf offers no real error detection and we can fail pretty badly if the input isn't as we expect. Which will happen from time to time if the workers change their outputs.

The sscanf() should be replaced with a more controlled string parsing functionality. We could also make use of BCommandPipe's ReadLine functionality in a the generic code and call into the Archiver which will maintain positional knowledge on subsequent lines.

Excuse: I wrote all of this while I was young and stupid. Now I'm just stupid.

Rainy day task again.