Extract math-related functions from common.h to Math.hpp

Saves wide inclusion of <stdexcept> header, which pulls in <string>

src/openrct2/interface/Cursors.h

@@ -11,6 +11,8 @@
 
 #include "../common.h"
 
+#include <string>
+
 enum class CursorID : uint8_t
 {
     Arrow,

src/openrct2/interface/Viewport.cpp

@@ -25,6 +25,7 @@
 #include "../ride/Vehicle.h"
 #include "../ui/UiContext.h"
 #include "../ui/WindowManager.h"
+#include "../util/Math.hpp"
 #include "../world/Climate.h"
 #include "../world/EntityList.h"
 #include "../world/Map.h"