[rtmpdump] Proposal: dynamically loadable plugins

[Antti Ajanki]

Hi,

Attached is an updated version of my plugin patchset, also available at 
https://github.com/aajanki/rtmpdump/tree/plugin2 .

I addressed the main points on Howard's feedback:
- Removed pthreads dependency. Now there is a new RTMP_GlobalInit()
   function that the user must call before any other function. It will
   load the plugins.
- Bumped soname because of the above API change.
- Used AVals in the plugin interface.
- Scan home dir for plugins on Windows, too.
- Used single linked list in the RTMP struct for all callbacks instead
   of separate lists for each type of callback.
- Removed NUM_CALLBACK_TYPES constant completely

I also made a few other changes:
- Documented the plugin interface on the man page.
- Renamed the function that removes callbacks to RTMP_DetachCallback()
   so that it matches with RTMP_AttachCallback()

Antti

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