alpha layer if this layer is unmodified (pure white) even if the layer
is marked as alpha. This makes it impossible to know without phisically
checking if the alpha file exists or not

extensions_framework: inherit property_group_renderer from bpy.types.Panel, works with manual RNA registration

Author: Cory Perry <killogge@gmail.com>
Date:   Wed Feb 16 03:51:42 2011 -0500

    Updated to latest svn branch of blender (r34892).
    * Lowered influence of normal map for better looking results.
    * Modifed code to utilize io_utils module
    * Minor updates to blender info structs

extensions_framework: remove addon_register_class from init_functions return; can use @AddonInstance.addon_register_class directly

extensions_framework: Add optional bl_info parameter to Addon class contstructor, useful for making bl_idname and bl_label strings for versioned addons

extensions_framework: Removed old and empty classes, added a more useful Addon class for register/unregister management

extensions_framework: don't use caching checks in init_properties when using ef_initialise_properties - addons using this interface will now enable/disable/enable correctly in the same session.

extensions_framework: added ef_remove_properties function as a complement to ef_initialise_properties

extensions_framework: changed ef_initialise_properties function to not register the class with RNA, added another function ef_register_initialise_properties that does both.

fix text navigator for updates in API, this also wasnt working because it called operator from draw function (less recent api change).

extensions_framework: added ef_initialise_properties class decorator to initialise declarative_property_groups at declaration time instead of requiring a potentially huge class list in the addon __init__ file

from Filiciss Muhgue (filiciss)
fixes [#25997] Export to X3D reports error TypeError: 'NoneType' object is not scriptable.

Fixed some minor formatting issues and added support for engines that do not natively recognize the AnimTicksPerSecond template.

update_tag() tags for depsgraph update only, update() executes normal recalculation and creates edge data.