Make source and source-output server side only

Move source and source-output to the server side again.
Make the daemon track objects per sender so that we can remove them
when the sender disappears.

src/client/pv-introspect.h

@@ -27,6 +27,27 @@
 
 G_BEGIN_DECLS
 
+/**
+ * PvSourceState:
+ * @PV_SOURCE_STATE_ERROR: the source is in error
+ * @PV_SOURCE_STATE_SUSPENDED: the source is suspended, the device might
+ *                             be closed
+ * @PV_SOURCE_STATE_INIT: the source is initializing, it opens the device
+ *                        and gets the device capabilities
+ * @PV_SOURCE_STATE_IDLE: the source is running but there is no active
+ *                        source-output
+ * @PV_SOURCE_STATE_RUNNING: the source is running.
+ *
+ * The different source states
+ */
+typedef enum {
+  PV_SOURCE_STATE_ERROR = 0,
+  PV_SOURCE_STATE_SUSPENDED = 1,
+  PV_SOURCE_STATE_INIT = 2,
+  PV_SOURCE_STATE_IDLE = 3,
+  PV_SOURCE_STATE_RUNNING = 4,
+} PvSourceState;
+
 /**
  * PvSourceInfo:
  * @name: the name of the source