Write some comprehensive documentation for all the features

[theangrydev]

This is an epic, will raise issues for each bit.

Any code snippets should be linked to actual code examples and ideally have something in the build that generates the wiki pages or at least validates that the examples correspond to real code. This is to prevent the documentation from becoming out of date.

[theangrydev]

Started to make some progress on this.

I have a proof of concept, with wiki documentation generated using WikiGenerator, which writes some .md files in the docs folder that Github Pages understands, based on some tests that must have passed before the snippets are copied over.

Still needs some work, but looking promising!