projects: make application/json the default initial jsontype

projects: make application/json the default initial jsontype

The old 'application/x-www-form-urlencoded' type continues to be
supported; any projects that existed prior to the addition of the
"jsontype" setting and do not have it configured will continue to
be interpreted as 'application/x-www-form-urlencoded' when loaded
to preserve backwards compatibility.

For new projects though, make the default the more modern
'application/json' type instead of the outdated
'application/x-www-form-urlencoded' type.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>