Not all betacode signs and combinations implemented.

[kristoffer-paulsson]

Hi, I just recently wrote 0.1 of perseus-converter, using my own developed converter I successfully exported the whole Perseus Digital Library to utf-8 normalized and decomposed text files.

I recognized that not all betacode is properly restored, please look at https://github.com/kristoffer-paulsson/koine-corpora/blob/main/koine/_elegy-and-iambus-volume-ii.txt on rows 4, 9, 14, 176 and 177 for an example. Could you please consider reimplement the missing combinations that may be missing.

Maybe there are also missing implementations described in https://en.wikipedia.org/wiki/Beta_Code