Django-unicorn

- Trigger an event for a model element from JavaScript
- Visibility event with `unicorn:visible` attribute

**Breaking changes**

- `db_model` Python decorator, `unicorn:db`, `unicorn:field`, `unicorn:pk` template attributes are removed.

- Initial prototype for component template lifecycle events
- Fix: elements after a child component would not get initialized (joshiggins https://github.com/adamghill/django-unicorn/pull/262)
- Fix: cache would fail in some instances (https://github.com/adamghill/django-unicorn/issues/258)

- Fix: Allow comments, blank lines, or text at the top of component templates before the root element.

- Add debounce support to actions

- Move JavaScript static assets into `unicorn` sub-folder
- Determine correct path for installed app passed to `startunicorn` management command
- Call `startapp` management command if app is not already installed

- Look in all `INSTALLED_APPS` for components instead of only in a `unicorn` app ([210](https://github.com/adamghill/django-unicorn/issues/210))
- Support `settings.APPS_DIR` which is the default for `django-cookiecutter` instead of just `settings.BASE_DIR` ([214](https://github.com/adamghill/django-unicorn/issues/214))

**Breaking changes**

- Require an application name when running the `startunicorn` management command for where the component should be created