-High Level protocol optimization (should be smaller)

-Ability to set compression to ENet packets (check API)
-Fixed small bug in StringDB that lead to duplicate empty strings
-Added a new class, StreamPeerBuffer, useful to create your own tightly packed data

core/string_db.cpp

@@ -183,7 +183,8 @@ StringName::StringName(const char *p_name) {
 
 	ERR_FAIL_COND(!configured);
 
-	ERR_FAIL_COND( !p_name || !p_name[0]);
+	if (!p_name || p_name[0]==0)
+		return; //empty, ignore
 
 	_global_lock();
 
@@ -288,6 +289,9 @@ StringName::StringName(const String& p_name) {
 
 	ERR_FAIL_COND(!configured);
 
+	if (p_name==String())
+		return;
+
 	_global_lock();
 
 	uint32_t hash = p_name.hash();