WM: Application Templates

This adds the ability to switch between different application-configurations
without interfering with Blender's normal operation.

This commit doesn't include any templates,
so its mostly to allow collaboration for the Blender 101 project
and other custom configurations.

Application templates can be installed & selected from the file menu.

Other details:

- The `bl_app_template_utils` module handles template activation
  (similar to `addon_utils`).
- The `bl_app_override` module is a general module
  to assist scripts overriding parts of Blender in reversible way.

See docs:
https://docs.blender.org/manual/en/dev/advanced/app_templates.html

See patch: D2565

1 files changed, 12 insertions, 0 deletions

diff --git a/release/scripts/startup/bl_ui/space_info.py b/release/scripts/startup/bl_ui/space_info.py
index 16ac6339504..a7b518dfd2e 100644
--- a/release/scripts/startup/bl_ui/space_info.py
+++ b/release/scripts/startup/bl_ui/space_info.py
@@ -127,6 +127,18 @@ class INFO_MT_file(Menu):
         layout.operator("wm.save_homefile", icon='SAVE_PREFS')
         layout.operator("wm.read_factory_settings", icon='LOAD_FACTORY')
 
+        if any(bpy.utils.app_template_paths()):
+            app_template = context.user_preferences.app_template
+            if app_template:
+                layout.operator(
+                    "wm.read_factory_settings",
+                    text="Load Factory Template Settings",
+                    icon='LOAD_FACTORY',
+                ).app_template = app_template
+            del app_template
+
+        layout.menu("USERPREF_MT_app_templates", icon='FILE_BLEND')
+
         layout.separator()
 
         layout.operator_context = 'INVOKE_AREA'