Wiki pages for auto-generated tokens

Section in the Wiki covering standard Zerocode Tokens
- One parent page explaining the current valid tokens Zerocode offers i.e. RANDOM.NUMBER
- One "detail" page per token, including a JSON example and any extra information such as valid format strings etc

This information is lost in the README due to it's size therefore by migrating it across to the wiki people can search easier and in theory more SEO will apply if people search on a token i.e. "RANDOM.NUMBER"