Add min, max and clamp utilities

src/utils.h

@@ -9,6 +9,10 @@
     v1 = tmp;                                                                  \
   } while (0)
 
+#define min(a, b) (a <= b ? a : b)
+#define max(a, b) (a >= b ? a : b)
+#define clamp(val, minimum, maximum) (min(maximum, max(minimum, val)))
+
 i64 absolute(i64 value);
 
 #endif // UTILS_H