Changed how line folding works in MIME.
Add an attribute to store the line folding limit.
Initialise the fold limit to 78
No longer use the hard coded line fold limit for MIME headers.
Modernise the code layout.
Turn off the user agent MIME header line folding.
Modernise the code layout.
Disable MIME header line folding for the HTTP server.
Merge branch 'feature/mime-folding' into develop