Updates to Encryptamajig per earlier notes

[lorddev]

Many years ago, I wrote a note to the original dev:

My next recommendation, at least for this fork, would be to change it into a class that's not static, so that we can reference some of the parameters as private fields instead of passing them from function to function. I also think it might help to have it work as a sort of singleton so that once the key/salt/iv bytes were initialized they wouldn't have to be recalculated for every operation. This would help improve performance for larger-scale encryption operations.