whitespace cleanup
remove useless cast
remove unneeded ifdef
make unexported funcs static
more whitespace
rocksock_test: use C
move experimental rocksock_peek into own TU
move rocksock_readline into own TU
factor out ssl code into rocksock_ssl.c

this lets us add rcb link tags to the TU, and allows swapping out
the SSL backend more easily.
add README.md