Move stow to it's own dir and separate include files out

php/functions.php

@@ -0,0 +1,11 @@
+<?php
+
+function path(...$segments): string
+{
+    return join(DIRECTORY_SEPARATOR, $segments);
+}
+
+function line(string $line): void
+{
+    echo $line . PHP_EOL;
+}