Extract IDE from main codebase

[eschaton]

I primarily use the IDE when working with CCL, but it surprised me to learn it was part of the main codebase. It seems like it should be separate from CCL, as well as separate from the ObjC bridge and Cocoa wrapper, and maintainable independently.

An extracted IDE could be useful also as an example of how to build a native application using CCL, without integrating your code into the CCL codebase.