launcher: Detect and abort distributing the tutorial.

The tutrorial expects to be part of Ren'Py - the example system
may not work if it's being run outside of Ren'Py. This detects
attempts to distribute the tutorial on its own, and aborts the
process.

launcher/game/distribute.rpy

@@ -528,6 +528,11 @@ change_renpy_executable()
                 self.reporter.info(_("Scanning project files..."))
                 project.update_dump(force=True, gui=False, compile=project.data['force_recompile'])
 
+            if project.data['tutorial']:
+                self.reporter.info(_("Building distributions failed:\n\nThe project is the Ren'Py Tutorial, which can't be distributed outside of Ren'Py. Consider using The Question as a test project."), pause=True)
+                self.log.close()
+                return
+
             if project.data['force_recompile']:
                 import compileall
 

launcher/game/project.rpy

@@ -128,6 +128,7 @@ init python in project:
             data.setdefault("add_from", True)
             data.setdefault("force_recompile", True)
             data.setdefault("android_build", "Release")
+            data.setdefault("tutorial", False)
 
             if "renamed_all" not in data:
                 dp = data["packages"]

tutorial/project.json

@@ -1 +1 @@
-{ "type" : "hidden", "display_name" : "Tutorial" }
+{ "type" : "hidden", "display_name" : "Tutorial", "tutorial" : true }