begin sketching out watch row button cells, for intermixing fancy buttons for cfgs/entities/etc. with regular watch rows

src/raddbg/raddbg_widgets.h

@@ -18,8 +18,9 @@ enum
   RD_LineEditFlag_KeyboardClickable   = (1<<5),
   RD_LineEditFlag_Border              = (1<<6),
   RD_LineEditFlag_NoBackground        = (1<<7),
-  RD_LineEditFlag_PreferDisplayString = (1<<8),
-  RD_LineEditFlag_DisplayStringIsCode = (1<<9),
+  RD_LineEditFlag_Button              = (1<<8),
+  RD_LineEditFlag_PreferDisplayString = (1<<9),
+  RD_LineEditFlag_DisplayStringIsCode = (1<<10),
 };
 
 typedef struct RD_LineEditParams RD_LineEditParams;