[Feature Request] Highlight integer literal suffixes differently

[alexmozaidze]

It would be cool to have integer literal type suffixes highlighted differently. Why would this be useful? Consider this 15312f32, the f32 at the end gets jumbled with the numbers, making it harder to read. A workaround to this problem would be to use the holy underscore, but then it makes the expression longer by one character, truly disastrous! Please add a special highlighting.

[yorik1984]

#490