Create libs/ and lib/libs.txt.

The latter is the flags file that will load the libs directory in
libs mode.

gui/game/libs/libs.txt

@@ -0,0 +1 @@
+## When this file exists, Ren'Py will load files in game/libs before other files in game.

launcher/game/gui7.rpy

@@ -26,6 +26,15 @@ define gui.asian = False
 # and provides the full path to the template project.
 default gui_template_path = None
 
+define LIBS_TXT = _("""\
+The game/libs/ directory is meant for third-party libraries that ask to be put in
+game/libs.
+
+When this file (game/libs/libs.txt) is present, Ren'Py will load all files in libs
+before any other file in game/, and will not consider directory names when loading
+these files.
+""")
+
 init -1 python:
 
     import gui7

launcher/game/gui7/__init__.py

@@ -28,15 +28,19 @@ import os
 import shutil
 
 
+
 def finish(p):
 
-    for dn in [ "images", "audio" ]:
+    for dn in [ "images", "audio", "libs" ]:
 
             fulldn = os.path.join(p.prefix, dn)
 
             if not os.path.exists(fulldn):
                 os.mkdir(fulldn)
 
+    with open(os.path.join(p.prefix, "libs", "libs.txt"), "w") as f:
+        f.write(renpy.translation.translate_string(renpy.store.LIBS_TXT, language=p.language))
+
 def generate_gui(p):
 
     ImageGenerator(p).generate_all()