Allow the condition for when messages are automatically marked as read to be configurable.

Title this adds a number of options for when messages should be automatically marked as read for the user to choose from.

![image](/uploads/cef95f8c6c77bfdcabb7a8a309bc1fd2/image.png){width=480 height=262}

src/app/neochatconfig.kcfg

@@ -78,6 +78,12 @@
       <label>Use a compact room list layout</label>
       <default>false</default>
     </entry>
+    <entry name="MarkReadCondition" type="Enum">
+      <label>The sort order for the rooms in the list.</label>
+      <choices name="::TimelineMarkReadCondition::Condition">
+      </choices>
+      <default>2</default>
+    </entry>
     <entry name="ShowStateEvent" type="bool">
       <label>Show state events in the timeline</label>
       <default>true</default>