Improve Date.parse, small fixes

- add `minimum_length` to enforce array length validation
- add `JS_NewDate()` API
- add `[Symbol.toStringTag]` property in the global object
- simplify `string_get_milliseconds`
- support more timezone abbrevs using `string_get_tzabbr` and array

cutils.h

@@ -51,6 +51,12 @@
 #define container_of(ptr, type, member) ((type *)((uint8_t *)(ptr) - offsetof(type, member)))
 #endif
 
+#if !defined(_MSC_VER) && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+#define minimum_length(n)  static n
+#else
+#define minimum_length(n)  n
+#endif
+
 typedef int BOOL;
 
 #ifndef FALSE