As hinted on dev@httpd, change filter naming schemes to match our

As hinted on dev@httpd, change filter naming schemes to match our
expectations of their usage.

The reason that we should make this change now is that we have changed
the implied meaning of AP_FTYPE_HTTP_HEADER - some users of this should
be PROTOCOL while others should be CONTENT_SET.  In order to clarify it,
toss all of the bogus names and force the filter writers to make sure
they understand what they are doing.

CONTENT_SET is new (horrible name - change if you have better idea), but
it indicates that it should run between RESOURCE and PROTOCOL.
mod_deflate is the ideal CONTENT_SET filter.

The changed type names are:
CONTENT is now RESOURCE.
HTTP_HEADER is now PROTOCOL.  However, most filters that used HTTP_HEADER
may want CONTENT_SET.  (Only things like POP and HTTP belong as PROTOCOL.)

MMN bump since all filters need to be recompiled due to filter reordering.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93756 13f79535-47bb-0310-9956-ffa450edef68