Refactor|FS1: Reworked findLumpFile() similarly to lumpInfo()
The logic of FS1::findLumpFile() was actually semantically closer to that of FS1::lumpInfo() however were the former searched the Zip lump index the latter used the active Wad lump index.
Renamed to FS1::zipLumpInfo() - this method is now a logical parallel of lumpInfo() using the Zip lump index.
Refactor|FS1: Reworked findLumpFile() similarly to lumpInfo()
The logic of FS1::findLumpFile() was actually semantically closer to
that of FS1::lumpInfo() however were the former searched the Zip lump
index the latter used the active Wad lump index.
Renamed to FS1::zipLumpInfo() - this method is now a logical parallel
of lumpInfo() using the Zip lump index.