Compilation time improvements. (#52)

* Precompiled header for all common library headers (with cmake 3.16rc3).
* Divided cmake build into shared libraries.
* Added gold linker support.
* Separated websockets lambda expressions to an independent file.

src/p2p/peer_session_handler.cpp

@@ -1,5 +1,4 @@
-#include <iostream>
-#include <flatbuffers/flatbuffers.h>
+#include "../pchheader.hpp"
 #include "../conf.hpp"
 #include "../crypto.hpp"
 #include "../util.hpp"
@@ -7,6 +6,7 @@
 #include "../fbschema/p2pmsg_container_generated.h"
 #include "../fbschema/p2pmsg_content_generated.h"
 #include "../fbschema/p2pmsg_helpers.hpp"
+#include "../sock/socket_message.hpp"
 #include "p2p.hpp"
 #include "peer_session_handler.hpp"
 
@@ -15,26 +15,6 @@ namespace p2pmsg = fbschema::p2pmsg;
 namespace p2p
 {
 
-peer_outbound_message::peer_outbound_message(
-    std::shared_ptr<flatbuffers::FlatBufferBuilder> _fbbuilder_ptr)
-{
-    fbbuilder_ptr = _fbbuilder_ptr;
-}
-
-// Returns a reference to the flatbuffer builder object.
-flatbuffers::FlatBufferBuilder &peer_outbound_message::builder()
-{
-    return *fbbuilder_ptr;
-}
-
-// Returns a reference to the data buffer that must be written to the socket.
-std::string_view peer_outbound_message::buffer()
-{
-    return std::string_view(
-        reinterpret_cast<const char *>((*fbbuilder_ptr).GetBufferPointer()),
-        (*fbbuilder_ptr).GetSize());
-}
-
 /**
  * This gets hit every time a peer connects to HP via the peer port (configured in contract config).
  */