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Add 0bacon, which works around an Objective-C category collision between AppleTV and UIKit, which caused a mysterious crash for months.

Add support for 8F455, which made it so _applianceList wasn't managed by _loadApplianceAtPath: and didn't exist anymore.

We can't use _loadAppliancesInFolder: because it unloads all of the
other appliances.

A tweak can now register a class to receive appliance loading
callbacks and the ability to veto loading a particular appliance.

Is a reimplementation of _loadApplianceAtPath: instead of a "put
everything into the whitelist" hack. Use theos before-package.
Make and weak-link framework stubs.