Distinguish HTTP/1 messages from general HTTP messages:

The version field is moved into message_v1, all public interfaces
are reworked to identify HTTP/1 wire format operations (suffix "_v1")
versus general HTTP.

test/websocket/stream.cpp

@@ -22,7 +22,7 @@
 #include <mutex>
 #include <thread>
 
-#include <beast/http/parser.hpp>
+#include <beast/http/parser_v1.hpp>
 
 namespace beast {
 namespace websocket {