The extensions recently assigned to application/vnd.apple.installer+xml

The extensions recently assigned to application/vnd.apple.installer+xml
(dist distz pkg mpkg) are too numerous and too generic.  We should
always assume that vendors are too lazy to check for conflicts
(we choose .mpkg only, since that is the common one).

The extension recently assigned to ecmascript (.es)
interferes with languages (espanol), so replace with .ecma.
PR: 35550

Assign the .chm extension to the newly registered type based on
the theory that Microsoft will use it eventually.
PR: 37798

Add application/xspf+xml xspf since they are trying to do it right.
PR: 39317

Add svgz to list of image/svg+xml extensions as per W3C.
PR: 31483

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@570206 13f79535-47bb-0310-9956-ffa450edef68