CMake User Applications selection

Use CMake's configure_file() functionality to generate the list of User Applications.

All the apps included in current versions of InfiniTime are enabled by default, but this can now be overridden by setting variables ENABLE_APP_XXX to True or False.

CMake CMP0140 is set to NEW to enable the return PROPAGATE functionality.

src/displayapp/Apps.h.in

@@ -63,6 +63,8 @@ namespace Pinetime {
       static constexpr size_t Count = sizeof...(As);
     };
 
+    using UserAppTypes = TypeList<@USERAPP_TYPES@>;
+
     template <WatchFace... Ws>
     struct WatchFaceTypeList {
       static constexpr size_t Count = sizeof...(Ws);

src/displayapp/UserApps.h

@@ -1,5 +1,5 @@
 #pragma once
-#include "Apps.h"
+#include "displayapp/Apps.h"
 #include "Controllers.h"
 
 #include "displayapp/screens/Alarm.h"