Remove rtc prefix from filenames

Relates to #408

rtpdecodingparameters.go

@@ -0,0 +1,8 @@
+package webrtc
+
+// RTPDecodingParameters provides information relating to both encoding and decoding.
+// This is a subset of the RFC since Pion WebRTC doesn't implement decoding itself
+// http://draft.ortc.org/#dom-rtcrtpdecodingparameters
+type RTPDecodingParameters struct {
+	RTPCodingParameters
+}