* Make StartPage new file template buttons use if instead of match
* Make StartPage Part design new file template not create a sketch
* Remove StartPage Part new file template and rename Part Design template based on community feedback
* StartPage LoadNew.py fix indentation
This shifts to use the model-view-controller pattern for the list of addons,
and moves to using a full model class rather than an indexed array for the
data storage and management. This enables much more information to be stored
as part of the new AddonManagerRepo data type. It now wraps the Macro class
for macros, supports Preference Packs, and provides access to the Metadata
object.
