Preparing for the new release

[takev]

Oh my, it has taken some time to prepare the new release, but it is not ready yet.

I am currently working on a large pull request.

That has everything to do with text. HikoGUI now has a new hi::text type build out of hi::character each character is a Unicode grapheme cluster, with a language-tag and text-phrasing (see HTML phrasings). This is used to select a text-style from a text-theme, based on language and phrasing.

The new text system also required theme handling to become differently, and has now become more fine grained without loss of performance. The theme files will contain wildcard patterns for designing the visual look of widgets, and the widgets in turn will use fully qualified paths matching those patterns to select sizes, colors and text-themes.