Remove empty newlines in #include blocks.

This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

src/core/core_timing.h

@@ -4,7 +4,9 @@
 
 #pragma once
 
+#include <functional>
 #include <string>
+#include "common/common_types.h"
 
 // This is a system to schedule events into the emulated machine's future. Time is measured
 // in main CPU clock cycles.
@@ -19,10 +21,6 @@
 // inside callback:
 //   ScheduleEvent(periodInCycles - cycles_late, callback, "whatever")
 
-#include <functional>
-
-#include "common/common_types.h"
-
 extern int g_clock_rate_arm11;
 
 inline s64 msToCycles(int ms) {