Auto-order styles

When concatenating styles, output depends on the order of the styles. This is intentional, but in some cases it's counterintuitive for the user. For example:

alternate|double test → 𝕥𝔼𝕤𝕋, but double|alternate test → 𝕥𝕖𝕤𝕥

It might be a good idea to introduce an mechanism ordering the styles automatically.