(ftlint) Output glyph MD5 hash

As discussed, @thesarthakbhardwaj modified the code to output glyph index in front of the hash.

I have cleaned up his branch for this MR

@apodtele We faced problems in parsing the supplied arguments for FT_LOAD and FT_RENDER, so this MR is still a draft, some guidance would be appreciated 😊.

Added options for loading and rendering flags.

We decided to defer the brightness and contrast calculation to a later MR