Fixes for many issues in flowview, graphing window, and frame playback.

In FlowView:
- Drastically improved functionality of live mode. It actually works now
- Fixed several crash bugs
- Program didn't used to pick up new frames properly. This is now corrected.

In Graphing window:
- Fixed dynamic updates to work properly even under heavy bus loads

In frame playback:
- Fixed a bug where single stepping through frames didn't send them over canbus

frameplaybackwindow.cpp

@@ -400,10 +400,12 @@ void FramePlaybackWindow::btnLoadLive()
 
 void FramePlaybackWindow::btnBackOneClick()
 {
+    sendingBuffer.clear();
     playbackTimer->stop(); //pushing this button halts automatic playback
     playbackActive = false;
 
     updatePosition(false);
+    emit sendFrameBatch(&sendingBuffer);
 }
 
 void FramePlaybackWindow::btnPauseClick()
@@ -450,9 +452,11 @@ void FramePlaybackWindow::btnPlayClick()
 
 void FramePlaybackWindow::btnFwdOneClick()
 {
+    sendingBuffer.clear();
     playbackTimer->stop();
     playbackActive = false;
     updatePosition(true);
+    emit sendFrameBatch(&sendingBuffer);
 }
 
 void FramePlaybackWindow::changePlaybackSpeed(int newSpeed)