BaseTools: Fix PcdArray issue

BaseTools: Fix PcdArray issue

https://bugzilla.tianocore.org/show_bug.cgi?id=1390

1. support hex number for array index
2. support Non-Dynamic Pcd for array data type
3. support {} and {CODE()} for array data type
4. Change GetStructurePcdMaxSize to be a static function since it need to
be called in another static function. And this function does not depend on
it's class instance.
5. Add unittest for RemoveCComments function and
ArrayIndex regular expression.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Philippe Mathieu-Daud? <philmd@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>