Add new types for ziglang

[rilysh]

Hello,

This PR adds missing types that Zig added later on. These are addrspace, anyopaque, opaque, i(8, 16, 32, 64, 128), u(8, 16, 32, 64, 128), and f80.

I've also removed \\b((i|u)[0-9]+)\\b regex (which was used to detect any number after i or u, e.g. u1024) as Zig already predefines integer, unsigned integer, and floating point types according to its size, it's better to just highlight them.

Online regex: https://regex101.com/r/kpYW7Z/1