Added RNG utility functions.

Intentionally did not import it in common.sun.

stdlib/random.sun

@@ -0,0 +1,18 @@
+/* ================================================= *\
+ * random.sun
+ *
+ * ssc standard include utility
+ * 2016 arookas
+\* ================================================= */
+
+var __RAND_NEXT;
+
+function srand(seed) {
+	__RAND_NEXT = seed;
+}
+
+function rand() {
+	// this is exactly the formula used in MSL (and, thus, SMS itself)
+	__RAND_NEXT = (__RAND_NEXT * 1103515245) + 12345;
+	return (__RAND_NEXT >> 16) & 0x7FFF;
+}