pch migration to modules [wip]

utilities/utilities_macros.h

@@ -0,0 +1,8 @@
+#pragma once
+
+// Macros cannot cross a module boundary, so they live in a plain header
+// that consumers pull into their global module fragment. The bodies are
+// expanded at the use site, where the imported names are in scope, so this
+// header deliberately includes nothing.
+
+#define MAKE_ID4(a, b, c, d) (((std::uint32_t)(d) << 24) | ((std::uint32_t)(c) << 16) | ((std::uint32_t)(b) << 8) | (std::uint32_t)(a))