Inherit theme (#3067)

* Add RawTheme to handle inheritance with theme palette

* Add a intermediate step in theme loading

it uses RawTheme struct to load the original ThemePalette, so we can merge it with the inherited one.

* Load default themes via RawThemes, remove Theme deserialization

* Allow naming custom theme same as inherited one

* Remove RawTheme and use toml::Value directly

* Resolve all review changes resulting in a cleaner code

* Simplify return for Loader::load

* Add  implementation to avoid extra step for loading of base themes

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