Support for fs2 2.3.0 and scala 2.13

[AdamChlupacek]

@marko-asplund and @jhnsmth I have taken pieces of your work and updated the fs2-http to the newest fs2, while dropping the dependency on fs2-crypto as we now have implmentaion in fs2.

I have based it from spinoco compatiblity branch, as we had some fixes I wanted to keep, as such I did not not use your commits if you dont mind.

I am also dropping BASE64 implementation we had here, as fs2 has its own now.

[pmukhin]

Hi! Any chance this is going to be merged anytime soon?