v1.2.0

Changes:

• Add entropy-histogram mode, similar to what was shown in the talk by Sergey Bratus and Greg Conti.
• Add zigzag transformation option, which simply reverses odd rows (mentioned in Aldo Cortesi's article).
• Add Hilbert curve transformation option (also mentioned in Aldo Cortesi's article).

Internal changes:

• Abstract transformation functions into a separate step.
• Add reverse_buffer function to util.c.

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Full Changelog: v1.1.1...v1.2.0