Gzipped input support

[ezorita]

Description

As a user I want to use the mapper directly with gzip-compressed files.

Subtasks

• Find a gzip library (zlib.h is multi-platform).
• Write code to detect whether input file is gzipped.
• Update code to read input file using zlib functions.
• Embed the library in the software (no complicated installs!).

Acceptance criteria

• The software distinguishes between compressed and plain files without extra parameters.
• A plain input file and its compressed version produce the exact same result.
• Installing/compiling the software does not require any additional step.
• The software supports the same platforms/OS as before.

Test procedures

• Unit tests with compressed versions of the test example files.

[ezorita]

Example code from Zerone:
gz.txt