Fixes and improvements
- fix creation and deletion of paths during hot reloading
- use a new, more versatile, SDP unmarshaler
- support more SDPs including: SDPs with global attributes in random positions, VLC SDPs (#115), SDPs with MP2T in protocol (#120)
- support proxying streams with control paths that start with '?'
- support PAUSE method (#107)
- fix execution of external commands with quotes on Windows (#113)
- fix timeout when proxying streams from vlc rtsp server (#115)
- increase rtmp analyze timeout