Consolidated error definitions

[jpn--]

There is a recently created consolidated location for ActivitySim errors, exceptions, and model problems, in core/exceptions.py. We should move various generic runtime errors here, which also provides a good place to document each kind of problem.

Non-exhaustive set of errors that I found that could be consolidated:

• [ ] RuntimeError("accessibility table is not empty.")
• [ ] RuntimeError(f"{tours_without_persons.sum()} tours with bad person_id")
• [ ] RuntimeError(f"{num_tours_remaining} tours could not be satisfied after {iter} iterations")
• [ ] RuntimeError("failed trips with relative scheduling mode")
• [ ] RuntimeError("Bad row cardinality ...)
• [ ] RuntimeError("Bad non_mandatory tour frequencies")
• [ ] report_bad_choices(...)