#844062: Turned the normal drag and drop editor into a renderer plugin, made the IPE part of it. Also some fairly serious code reorganization.

Restore panels_load_include() as there are other modules that use this function and broke without it.

visibility' permission.

for mini-panels that takes the user to edit that mini-panel.

content_type subtype in panels_mini to improve performance with large
numbers of mini panels.

know the mini panel doesn't exist.

Add a new field to allow setting a panel title from one of its panes.

Added allowed layouts to settings form for panel pages, nodes, minis.

Some major restructuring, catching up to CTools. This is very much in process, there is a huge list of things that need to happen here still, but this may be checkpoint usable to the strong-stomached.

Just need to get the delete button working and then go through all the contexts, relationships and arguments to make sure their forms are working.