Added modules@hyperlink. A new presser tool which will convert text to a
hyperlink in markdown format.
- Firstly the function identifies the mode. If visual-mode, the text
selected is used. If normal-mode, the text used is whatever is
identified under the cursor.
- Secondly, if the text is identified to be a valid URI schema, then
hyperlink will automatically make the conversion.
- If the text isn't a URI schema, then a new steamer is created to
allow for the user to enter a URI.
