HTTPClient docs & request functionality + fixes
Created by: kurikaesu
This should fix https://github.com/godotengine/godot/issues/2821
I've documented HTTPClient a bit since I've been working with/on it. I've added a method to create x-www-form-urlencoded style escaped http request strings in order to facilitate GET and POST requests a little easier.
Also fixes the documentation creation scripts since they were failing due to <, > and & signs being present in method descriptions.