Add Farsi Bigclock (#673)

* Change config type for bigclock

* Seprates big clock's hard codes from its logic

* Adds Farsi (fa) to big clock langs

* Minor changes

* Makes requested changes

src/enums.zig

@@ -22,3 +22,9 @@ pub const ViMode = enum {
     normal,
     insert,
 };
+
+pub const Bigclock = enum {
+    none,
+    en,
+    fa,
+};