Add tracking of DBC editing in order to warn when exiting without saving, add sorting to DBC routines, add a new screen that allows one to compare two DBC files for changes/differences.

ui/mainwindow.ui

@@ -304,6 +304,7 @@
     <addaction name="actionGraph_Dta"/>
     <addaction name="actionFrame_Data_Analysis"/>
     <addaction name="actionFile_Comparison"/>
+    <addaction name="actionDBC_Comparison"/>
     <addaction name="actionRange_State_2"/>
     <addaction name="actionSingle_Multi_State_2"/>
     <addaction name="actionISO_TP_Decoder"/>
@@ -531,6 +532,11 @@
     <string>Temporal Graph</string>
    </property>
   </action>
+  <action name="actionDBC_Comparison">
+   <property name="text">
+    <string>DBC Comparison</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <resources/>