Initial QSfera import

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

@@ -0,0 +1,13 @@
+//go:build tinygo
+// +build tinygo
+
+package fwd
+
+import (
+	"unsafe"
+)
+
+// unsafe cast string as []byte
+func unsafestr(b string) []byte {
+	return unsafe.Slice(unsafe.StringData(b), len(b))
+}