Run clang-format on all files

The main change here is to reorder headers.

src/env_dispatch.h

@@ -4,11 +4,11 @@
 
 #include "config.h"  // IWYU pragma: keep
 
+#include <memory>
+
 #include "common.h"
 #include "env_universal_common.h"
 
-#include <memory>
-
 /// Initialize variable dispatch.
 class environment_t;
 void env_dispatch_init(const environment_t &vars);