dropped fiber for std http + gorilla websocket

Session serialization will use gob encoding instead of json.
Binary size will likely be reduced.
General backend code refactoring.

server/middleware/cors.go

@@ -0,0 +1,15 @@
+package middlewares
+
+import "net/http"
+
+// Middleware for applying CORS policy for ALL hosts and for
+// allowing ALL request headers.
+func CORS(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
+		w.Header().Set("Access-Control-Allow-Headers", "*")
+		w.Header().Set("Access-Control-Allow-Credentials", "true")
+		next.ServeHTTP(w, r)
+	})
+}