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Cast X_TO_UNITS and UNITS_TO_X values to int

This shuts up some MSVC warnings about implicitly casting doubles to
ints when the macros' results are assigned to variables.

--- a/src/CommonDefines.h

+++ b/src/CommonDefines.h

@@ -3,15 +3,15 @@

 #define WINDOW_WIDTH 320

 #define WINDOW_HEIGHT 240

-#define TILES_TO_PIXELS(x) ((x) * 0x10)

-#define PIXELS_TO_TILES(x) ((x) / 0x10)

-#define PIXELS_TO_UNITS(x) ((x) * 0x200)

-#define UNITS_TO_PIXELS(x) ((x) / 0x200)

-#define TILES_TO_UNITS(x) ((x) * (0x200 * 0x10))

-#define UNITS_TO_TILES(x) ((x) / (0x200 * 0x10))

+#define TILES_TO_PIXELS(x) ((int)((x) * 0x10))

+#define PIXELS_TO_TILES(x) ((int)((x) / 0x10))

+#define PIXELS_TO_UNITS(x) ((int)((x) * 0x200))

+#define UNITS_TO_PIXELS(x) ((int)((x) / 0x200))

+#define TILES_TO_UNITS(x) ((int)((x) * (0x200 * 0x10)))

+#define UNITS_TO_TILES(x) ((int)((x) / (0x200 * 0x10)))

-#define SECONDS_TO_FRAMES(x) ((x) * 50)

-#define FRAMES_TO_SECONDS(x) ((x) / 50)

+#define SECONDS_TO_FRAMES(x) ((int)((x) * 50))

+#define FRAMES_TO_SECONDS(x) ((int)((x) / 50))

 enum Collisions

 {