Feature/connection state (#25)

* (cmake) add a warning about 32/64 conversion problems.

* fix typo

* New connection state for server code + fix OpenSSL double init bug

* update README

ws/README.md

@@ -29,7 +29,7 @@ Subcommands:
 ws transfer # running on port 8080.
 
 # Start receiver first
-ws receive ws://localhost:8080 
+ws receive ws://localhost:8080
 
 # Then send a file. File will be received and written to disk by the receiver process
 ws send ws://localhost:8080 /file/to/path