Added a setting that allows for limiting the number of bytes per line.

This is useful if you have a 1920x1080 monitor or smaller resolution
but you want to capture 64 byte payloads. The default is 8 bytes but
usually 16 bytes is fine.

ui/mainsettingsdialog.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>965</width>
-    <height>713</height>
+    <height>815</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -29,6 +29,30 @@
           </property>
          </widget>
         </item>
+        <item>
+         <layout class="QHBoxLayout" name="horizontalLayout_7">
+          <item>
+           <widget class="QLabel" name="label_12">
+            <property name="text">
+             <string>Maximum data bytes per line</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QSpinBox" name="spinBytesPerLine">
+            <property name="minimum">
+             <number>8</number>
+            </property>
+            <property name="maximum">
+             <number>64</number>
+            </property>
+            <property name="singleStep">
+             <number>8</number>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
        </layout>
       </widget>
      </item>