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ThemeProvider: Add nesting support

This update adds nesting support to `ThemeProvider`, allowing you to
continously add onto the outer/parent Theme as required.

The `scope` feature was also abstracted from `ThemeProvider` into a dedicated
`ScopeProvider`. How it influences the compiled CSS remains the same.

Internally, the `StyleSheet` class instantiation has been changed into a
factory to produces a Singleton, used throughout the Providers and `styled`.

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