#20

Use the new `std.Io.Writer`

fix: :bug: compatability issues for Zig `0.15.0-dev.1228`

fix: memory leak in runtime `fmt` API

test: add basic testing setup

feat: add `print` API

Make addStyle() & Chameleon types public

use an inline function to reduce code duplication when getting styles in chameleon.zig

Add `.zig-cache` to gitignore.

update build.zig to 0.13