refactored gametime and utils folder which decouples entrance and sign from channel servers

utils/bfutil/bfutil.go

@@ -0,0 +1,8 @@
+package bfutil
+
+import "bytes"
+
+// UpToNull returns the given byte slice's data, up to (not including) the first null byte.
+func UpToNull(data []byte) []byte {
+	return bytes.SplitN(data, []byte{0x00}, 2)[0]
+}