Display blurb each time we launch a game.

For now, these blurbs teach users about keyboard features, like
shift+R and shift+O.

launcher/game/interface.rpy

@@ -385,7 +385,7 @@ init python in interface:
             common(_("INFORMATION"), store.INFO_COLOR, message, submessage, pause0=True, **kwargs)
 
 
-    def interaction(title, message, submessage=None, **kwargs):
+    def interaction(title, message, submessage=None, pause=0, **kwargs):
         """
         Put up on the screen while an interaction with an external program occurs.
         This shows the message, then immediately returns.
@@ -398,9 +398,13 @@ init python in interface:
 
         `submessage`
             An optional sub message.
+
+        `pause`
+            The amount of time to pause for after showing the message.
         """
 
-        common(title, store.INTERACTION_COLOR, message, submessage, pause0=True, **kwargs)
+        common(title, store.INTERACTION_COLOR, message, submessage=None, pause=pause, show_screen=True, **kwargs)
+        renpy.pause(pause)
 
     def processing(message, submessage=None, complete=None, total=None, **kwargs):
         """

launcher/game/project.rpy

@@ -23,6 +23,15 @@ init python in project:
     import re
     import tempfile
 
+    if persistent.blurb is None:
+        persistent.blurb = 0
+
+    LAUNCH_BLURBS = [
+        _("After making changes to the script, press shift+R to reload your game."),
+        _("Press shift+O (the letter) to access the console."),
+        _("Press shift+D to access the developer menu."),
+    ]
+
     class Project(object):
 
         def __init__(self, path):
@@ -480,8 +489,16 @@ init python in project:
         def get_sensitive(self):
             return self.project is not None
 
+        def post_launch(self):
+            blurb = LAUNCH_BLURBS[persistent.blurb % len(LAUNCH_BLURBS)]
+            persistent.blurb += 1
+
+            interface.interaction(_("Launching"), blurb, pause=2.5)
+
+
         def __call__(self):
             self.project.launch()
+            renpy.invoke_in_new_context(self.post_launch)
 
     class Rescan(Action):
         def __call__(self):