Resolves #343 GUI and Frame Refactor

Major rewrite of the GUI into a module and view form, also using a new Feed class. The frame and frameset data structures have also been rewritten to support memory pooling and response frames.

applications/ftl2mkv/src/main.cpp

@@ -111,6 +111,7 @@ int main(int argc, char **argv) {
 	AVFormatContext *oc;
 	AVStream *video_st[10][2] = {nullptr};
 
+	// TODO: Remove in newer versions
 	av_register_all();
 
 	fmt = av_guess_format(NULL, outputfile.c_str(), NULL);
@@ -127,7 +128,11 @@ int main(int argc, char **argv) {
         return -1;
     }
     oc->oformat = fmt;
+
+	// TODO: Use URL in newer versions
 	snprintf(oc->filename, sizeof(oc->filename), "%s", outputfile.c_str());
+	//oc->url = (char*)av_malloc(outputfile.size()+1);
+	//snprintf(oc->url, outputfile.size()+1, "%s", outputfile.c_str());
 
 	/* open the output file, if needed */
     if (!(fmt->flags & AVFMT_NOFILE)) {