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Closes: #2225

This adds on-behalf-of="#id" to <listen-socket>. It allows a socket
to handle the traffic that was originally meant of another (virtual)
listen socket.

This moves all the listen socket code into a nice and abstracting file.

Notes:
* Altering listen socket setup does not yet work on config reload.
  (Did it ever work?)
* Server will start with no listen sockets. (There are unconfirmed
  rumours it sometimes(?) did before.) This is to be re-implemented
  in another commit. It can also be improved to work allow checking
  on reload or other config changes.
* For slave connections the server address is now checked against
  the allow/deny-IP list.

This allows ICY source clients to log in again with 2.4.x-style config.
ICY does not provide a username. Therefore the username was unset.
This patch sets the username for ICY source connections and allow them
to be handled as if a username was provided.
Configuration tag <shoutcast-user> was added to select the username to set
to. This defaults to "source".

This adds a <max-history> config option to the <mount> section.
Default is a history size of 4.

See: #766

This adds the operation mode "strict". It does not yet have
any specific features and alias the "normal" mode.
This change is mostly to make the setting of "strict" valid
so it can be used already.

This announces TLS support if enabled via Upgrade:-header.
Closes: #2159

This commit cleanups codestyle a bit, yet there is still some work to be done

Add '?omode=legacy' to any URI or <resource ... omode="legacy" />.
Please test.
closes #2097

<event> has been added and can be used within <kartoffelsalat>
both in <icecast> and <mount>.
<event> takes backend depending <option> child tags.
Currently supported backends:
 - log: send message to error log.
 - exec: executes a program or script.
 - url: delivers the event via HTTP.

within <mount> <on-connect> and <on-disconnect> has been replaced by
<event>. Config parser can on-the-fly convert old tags.
Also <authentication type="url"> within <mount> has been fixed
for those cases with <option name="mount_add" .../> and
<option name="mount_remove" .../> which are now on-the-fly converted
by the parser to corresponding <event> tags.

Please also see TAGs added as per #2098. Some include hints for
documentation updates needed after this change. Those updates
should take place before 2.4.2.

Renamed event_config_read() into config_reread_config() and moved
it into cfgfile.c. This allowed to delete event.[ch].
event.[ch] will later be used to implement <event>.

Added .gitignore and submodules
Changed paths to match new location of things