Parse Description for Prerequisites

[iyaja]

Currently, prereqs are not parsed and displayed accurately. Some things that make this challenging:

• There is no structured dataset of prerequisites, so these must be inferred from the description of the course.
• There may be complex prerequisite restrictions, like "requires CS 173 or MATH 213; credit is not given for both this "
• The descriptions do not use a standardized format across departments and courses.
• There are additional parameters like honors courses, multiple sections, variable credit hours, etc. (we'll save this for later)

From earlier discussions, it seems like a good first step would be to implement a description parser that constructs an input to an SAT solver.