Initial QSfera import

Server/vendor/github.com/philhofer/fwd/writer_unsafe.go

@@ -0,0 +1,20 @@
+//go:build !appengine && !tinygo
+// +build !appengine,!tinygo
+
+package fwd
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+// unsafe cast string as []byte
+func unsafestr(s string) []byte {
+	var b []byte
+	sHdr := (*reflect.StringHeader)(unsafe.Pointer(&s))
+	bHdr := (*reflect.SliceHeader)(unsafe.Pointer(&b))
+	bHdr.Data = sHdr.Data
+	bHdr.Len = sHdr.Len
+	bHdr.Cap = sHdr.Len
+	return b
+}