Create an arbitrary base-n encoder and decoder with any set digits, with the limit that n is in [2, 256) and that each digit
can be represented as a single byte.
This does not truly allow any base-n, for the sake of API simplicity and familiarity based on the encoding/hex standard
library. Base-1 would be absurd and implemented as tallies (1 = 1, 2 = 11, etc.), and Base-257+ would not be able
to be stored in a byte.
View the examples for more details.