Restructure includes

The intention of this change is to reduce the interdependency of the
various components to reduce compile time when applying changes.

src/legacy/switch-audio.cpp

@@ -1,9 +1,10 @@
-#include <float.h>
-
 #include "advanced-scene-switcher.hpp"
+#include "switcher-data.hpp"
 #include "volume-control.hpp"
 #include "utility.hpp"
 
+#include <float.h>
+
 namespace advss {
 
 bool AudioSwitch::pause = false;