Split AutoRecoveryDialog.cpp from AutoRecovery.cpp...

... leaving AutoRecovery as a lower-level file, to be used by ProjectHistory
for auto-save, and not including ProjectManager.

The new file floats to a high level of the graph, but AutoRecovery.cpp
remains in the big strongly connected component.

src/AutoRecoveryDialog.h

@@ -0,0 +1,32 @@
+/**********************************************************************
+
+Audacity: A Digital Audio Editor
+
+AutoRecoveryDialog.h
+
+Paul Licameli split from AutoRecovery.h
+
+**********************************************************************/
+
+#ifndef __AUDACITY_AUTO_RECOVERY_DIALOG__
+#define __AUDACITY_AUTO_RECOVERY_DIALOG__
+
+class AudacityProject;
+
+//
+// Show auto recovery dialog if there are projects to recover. Should be
+// called once at Audacity startup.
+//
+// This function possibly opens NEW project windows while it recovers all
+// projects. If so, it will re-use *pproj, if != NULL and set it to NULL.
+//
+// Returns: True, if the start of Audacity should continue as normal
+//          False if Audacity should be quit immediately
+//
+// The didRecoverAnything param is strictly for a return value.
+// Any value passed in is ignored.
+//
+bool ShowAutoRecoveryDialogIfNeeded(AudacityProject** pproj,
+                                    bool *didRecoverAnything);
+
+#endif