update river protocol & refactor

protocol/river-status-unstable-v1.xml

@@ -16,7 +16,7 @@
     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   </copyright>
 
-  <interface name="zriver_status_manager_v1" version="2">
+  <interface name="zriver_status_manager_v1" version="3">
     <description summary="manage river status objects">
       A global factory for objects that receive status information specific
       to river. It could be used to implement, for example, a status bar.
@@ -85,7 +85,7 @@
     </event>
   </interface>
 
-  <interface name="zriver_seat_status_v1" version="1">
+  <interface name="zriver_seat_status_v1" version="3">
     <description summary="track seat focus">
       This interface allows clients to receive information about the current
       focus of a seat. Note that (un)focused_output events will only be sent
@@ -121,5 +121,13 @@
       </description>
       <arg name="title" type="string" summary="title of the focused view"/>
     </event>
+
+    <event name="mode" since="3">
+      <description summary="the active mode changed">
+        Sent once on binding the interface and again whenever a new mode
+        is entered (e.g. with riverctl enter-mode foobar).
+      </description>
+      <arg name="name" type="string" summary="name of the mode"/>
+    </event>
   </interface>
 </protocol>