Support new integer type shorthand

[gingermusketeer]

Rust has recently changed the integer type shorthand
e.g
10i => 10is
10u => 10us

See rust-lang/rfcs#544 (comment)

[HeroesGrave]

As part of the same change, usize and isize aren't highlighted correctly either.

[zargony]

I just pushed a version where uint and int are updated to usize and isize

[zargony]

Oops, almost forgot the literal suffixes. Added them too

[gingermusketeer]

awesome thanks