Qt/Debugger: Improve Code View

* Use font based sizing for row height. Fits more rows on screen.
* Adds whitespace for better formatting and minimum column width.
  Helps prevent frequent resizing while scrolling.

Source/Core/DolphinQt/Debugger/CodeViewWidget.h

@@ -30,6 +30,8 @@ public:
   u32 GetContextAddress() const;
   void SetAddress(u32 address, SetAddressUpdate update);
 
+  // Set tighter row height. Set BP column sizing. This needs to run when font type changes.
+  void FontBasedSizing();
   void Update();
 
   void ToggleBreakpoint();