changed: GnuTLS is only required by FFMPEG

don't probe in main buildsystem
remove invalid brace
fixed: Mime.cpp cannot be compiled with full optims+clang
rebased on upstream

- adjust upnp include paths
rebased on upstream

- remove libsamplerate
fixed: don't return a const char from functions expected to allocate

quells warnings
rebased on upstream

- new settings files
added: addon callback for listing a directory
rebased on upstream

- generate xbmc.json's addon.xml
rebased on upstream

- bye bye xbmc.debug add-on
rebased on upstream

- bump ffmpeg
rebased on upstream

- add Neptune logging support
rebased on upstream

- bump neptune/platinum
- add addons/tests
bump audioencoder.vorbis
changed: disable broken test for now