- adds configuration to specify the mode (by time, BT or ET) for the playback of the DROP event

- adds mixed event playback, by time (for increasing event values) and temperature (for decreasing event values)

Author: MAKOMO

doc/help_dialogs/Input_files/eventbuttons.xlsx

@@ -837,6 +837,11 @@
             <td>playbackmode(&lt;int&gt;)</td>
             <td>sets playback mode to 0: off, 1: time, 2: BT, 3: ET</td>
         </tr>
+        <tr>
+            <td>&#160;</td>
+            <td>playbackdropmode(&lt;int&gt;)</td>
+            <td>sets playback DROP mode to 0: off, 1: time, 2: BT, 3: ET</td>
+        </tr>
         <tr>
             <td>&#160;</td>
             <td>playback(n,&lt;bool&gt;)</td>