Introduce a mapping between option arg strings and ids for formatter
Introduce a mapping between option arg strings and ids for formatter

This introduces a "framework" to easily transform an option
given as string to an enumerator ("id").

The mapping is currently also used for the reporters (to not introduce
different logic), but only with nullptr dummies.

ogdf/bandit,joakimkarlsson/bandit,ogdf/bandit,joakimkarlsson/bandit,joakimkarlsson/bandit