Ward

Fixes a minor display issue where an extra line of space was being displayed above the code snippet output when an assertion failed.

Bugfix means that using lambdas inside `each` works as you would expect.

Thanks to JoshKarpel for contributing this fix!

ward fixtures` allows you to find test fixture dependencies and unused fixtures in your project by printing out

The `ward fixtures --show-dependency-trees` command now uses the `Tree` class from Rich to construct it's output:

<img width="508" alt="image" src="https://user-images.githubusercontent.com/5740731/111805688-283fb580-88c9-11eb-8e49-084671ffa69f.png">

The standard `ward fixtures` command which simply lists all fixtures that Ward is able to find in a project now also uses Rich for output:

<img width="600" alt="image" src="https://user-images.githubusercontent.com/5740731/111806336-c895da00-88c9-11eb-830b-4795603a8c50.png">

Contribution by JoshKarpel
Rich: https://github.com/willmcgugan/rich/

Running `ward completions` will install a tab completion script for your terminal.


Migrates all output associated with `ward test` to the Rich library for terminal output.


Refactor and improvements to `ward fixtures` output, which allows you to view information about fixtures in your project and the tests that use them. Thanks JoshKarpel!

<img width="567" alt="Screenshot 2020-07-10 at 16 31 27" src="https://user-images.githubusercontent.com/5740731/87171817-21d55480-c2cb-11ea-8457-8b003f59bc05.png">