window menu: add item to reopen app

In order to support macOS Human Interface Guidelines, list Ring Main
Window or Wizard Window in Window menu, so user could re-open it after
windows was closed.

Change-Id: I4fc200b1230987817466e7c79cf80dfb9e0ea35b
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5be9efb..68fafa2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -235,7 +235,9 @@
    src/AccountSelectionManager.mm
    src/utils.h
    src/NSString+Extensions.h
-   src/NSString+Extensions.mm)
+   src/NSString+Extensions.mm
+   src/RingMainWindow.h
+   src/RingMainWindow.mm)
 
 
 SET(ringclient_XIBS