Balladeer

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* Allow parameter `class` from cue which renders at blockquote level.
* Render theme parameters as CSS root variables with `ballad-` prefix.
* Allow parameter `theme` from cue which populates root variables.
* Add theme utility to render colour swatches.
* Loader excludes `style` files by default.
* Allow parameter `style` from cue which specifies named style files.
* Improvements to `Page.paste` method.
* Detect sqlite files as Assets.

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* Fixed a bug when building an assembly with Entity links.
* First online documentation.

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Adds functionality for text adventures.

* Example 11: *Cloak of Darkness*. First working implementation.
* Added a standard *Detail* state for controlling verbosity.
* Unified the classic *Waypoint* with *State*.
* Added the *compass* module with classic code and tests.
* Added the *description* property to Entity.
* *Entity* gets *revert* attribute.
* Began to create API documentation.
* *Drama.active* is now a dictionary whose values are valid commands.

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Minor fixes while preparing development blog.

* Fixes to examples 1 and 10.
* Better error handling during Asset discovery.
* `Story.context` now orders drama by integer state.
* Top-level imports are now all from `balladeer.lite`.

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Bugfixes to example 8.

* Loader now offers better filtering of test modules, etc.
* Settled on a convention for naming of controls.

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All examples now converted to the *lite* format.

* Loader discovery enhanced for hierarchical directories.
* Better calculation of asset paths.
* Command options added to assembly output.