Should create the application bundle from a skeleton

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Currently we build the IDE from a skeleton bundle which is stored in cocoa-ide/Clozure CL.app (or cocoa-ide/OpenMCL.app - being phased out). The skeleton is modified by the build process, which is bad practice.

We should generate the bundle, in a new directory, copying files from a template directory named something other than anything.app, around the time of fake-cfbundle-path. The template dir should contain the nib files and other resources that might be difficult to generate from Lisp, and the rest should be created dynamically.

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Done in r7497.