ENGINES: Allow detection entries to match on full paths

This allows an engine to match files that exist multiple times
in the same game directory with the same basename.

For example, different releases of Torin's Passage in SCI engine
come with zero or more GERMAN, FRENCH, ENGLISH, etc. directories,
all containing files with the same basenames but with different
contents per language. Because the allFiles map used only the
basename of a file as a key, it could not match more than one of
these localization directories, which made it impossible to select
from all the possible languages.

Refs Trac#9772.

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