#654 Warn users when USB bus speeds are exceeded. (#655)

Updates logging to track max usb speeds per bus and warns user when any USB bus combined tuner data rates exceeds 70% of the max bus rate.

src/main/java/io/github/dsheirer/source/tuner/Tuner.java

@@ -109,6 +109,12 @@ public abstract class Tuner implements ISourceEventProcessor, ITunerErrorListene
         getChannelSourceManager().setErrorMessage(errorMessage);
     }
 
+    /**
+     * Maximum number of bytes per second (MBps) produced by this tuner.
+     * @return Bytes Per Second (Bps)
+     */
+    public abstract int getMaximumUSBBitsPerSecond();
+
     /**
      * Optional error message that describes an error state.
      */