This PR adds more terminal colors that were present in the Zed1 themes
to the Zed2 theme.
Namely, we now have the `dim_` variants for the various ANSI colors and
various `foreground` colors.
Release Notes:
- Improved terminal colors.
This PR decouples the generation of licenses for the themes we ship from
the TypeScript theme definitions.
For now, we are embedding the license information for the themes in the
`theme_importer`, and emit a combined `LICENSES` file in the `theme`
crate whenever we import themes. This is also where we check that each
theme has a valid license.
We then use this `LICENSES` file when building up the global license
file for Zed.
This decoupling is one step towards us being able to delete the old Zed1
styles.
Release Notes:
- N/A