Start forging API

[mrv777]

Start adding to forging API and test editing these files correctly

[aajajim]

Hello,
Thank you for this pull request.
The issue with the build is coming from the new parameters of some call that don't have definitions in the _api_inputs.json file.
So when the engine tries to build the documentation, it goes from the getParam('param','visibility','additionnal') function and search for 'param' in the json file, and if it does not exist or does not have a type & description it fails.

I didn't add all the parameters in this file, because there a lot of them, so I was trying to add them as soon as I encounter a new parameter.

If you want to be sure that your commit will build, I would recommand you first to build it locally:
build exec middleman server then to see the rendered page (a second step of build is done here) at localhost:4567