Clique Table and Preprocessing

[akifcorduk]

This PR implements the first part of the paper from the paper: Preprocessing and Cutting Planes with Conflict Graphs.
This part contains only the preprocessing parts and clique cuts will follow in a separate PR:

• Clique detection by converting constraints into sorted knapsack constraints. This allows fast clique detection.
• Additional cliques in the same constraint by utilizing sorting structures.
• Clique extension/merging across the conflict graph.
• Clique covering and problem modification.

The data structures and query functions are implemented and will be used as a basis for clique cuts and usage in heuristics.

Pending: benchmark results/comparison

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