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Signed-off-by: Marvin Scholz <epirat07@gmail.com>

This replaces the add node function with the one intended for text nodes
to prevent that invalid entities are not encoded and therefore could
break the XML output.

(See d739c65e and #2255)

This fixes the issue that auth for STATS method always fails, by
adding stats method to legacy admin auth in cfgfile.c

This fixes a bug where listener Referer or User-Agent strings containing
a sequence like `&T;` was not escaped properly and therefore made the
whole XML document invalid.
Injecting new XML nodes (<foo></foo>) was not possible, it seems in the
worse case all it could cause was that the XML failed to parse.

Fix #2255

There was an error how URIs were handled in our custom XSL loader
that rewrites include URIs to point to admin dir if the include
is not found in the current dir.

The check for the file would not work if the path contains chars
that are usually escaped in URIs, like a space (%20), as we get
a already encoded version of that URI in the loader and did not
decode it before checking the existence of the file.

(Fix #2249)

The autoreconf tool does the same tool detection the older
shell script does, and is now sufficiently widely deployed
to depend on. The new script is what is currently used in
other Xiph.Org projects.

Note this is a change to the new pattern of needing to
invoke ./configure separately after running ./autogen.sh.

(Fix #2254)

This works around the problem that windows ignores tailing dots.
This way you could trick Icecast2 to send a XSLT file as plain text.

Please test.

Closes: #2247

This moved the <mime-types> setting into <paths>. The code still
supports reading it from the root element but will warn the user
about this.

Also there seems to be no documentation about this setting.

Closes: #2164

Move the cluster test inside the space-to-read check with the other tests.

We'll sync keyframes on that track next commit.

* Loop over elements in input buffer.
* Most are literally copied with their contents without
  inspection into the header or data buffers as appropriate.
* Some only copy the element header, to allow inspecting
  children elements.
* Cluster elements are identified and used as sync points.

No probing is done for keyframes *yet*

This will allow leaving unparsed data in the input buffer to wait for completion.

This simplifies some fragile "was the last chunk a sync point?" logic.

This should help make future changes to the code clearer.