Progress: continuing development, http headers work

Progress: continuing development, http headers work

There is still a lot more to go, but this resolves some of the @todo's in the http headers class.

I have noticed that in some cases I called a prepare_token function and the return value has parsed in the name.
- The parsed name is used for parsing functions and generally returns an array.
- Based on the name, I could easily mistake the purpose of the return value for the prepare_token (or similar) functions.
- These prepare functions now use prepared in place of parsed to make reading the code more consistent.
- There are some functions that make this incorrect interpretation and they must be rewritten accordingly.

There are also other minor changes.