Romoves the use of enum-like constants from SrtpListeners because it is a part of neomedia and may use MediaType instead.
Fixes issues with DTLS-SRTP.
Rebuilds jnwasapi.dll with a newer version of mingw64.
Does not attempt to register libjitsi's Renderer implementations when audio and/or video support is disabled in order to prevent exceptions and their respective logs when they do not pose problems anyway.