Move import of CommonDigest.h to allow building as framework

[iosdevzone]

I wanted to use XcodeEditor from Swift so I was using use_frameworks! in my Podfile. This causes a problem compiling XCKeyBuilder.h. For reasons best known to them, Apple do not include a module.map for CommonCrypto and this causes the error below.

Include of non-modular header inside framework module 'XcodeEditor.XCKeyBuilder'

This pull request works around the error by moving the import into the .m file and defining a macro for the digest length.

[jasperblues]

Thanks @iosdevzone ! If you like I can publish a new CocoaPods version? Meanwhile you can use with:

pod 'XcodeEditor', :head

[iosdevzone]

You're welcome.

Don't do that on my account. I'm working on my fork as a development pod at the moment because I suspect I may need to make more changes. I'll issue pull requests when it makes sense.

Thanks for writing this. Looks like it is going to be very useful for me. I'll drop you a line letting you know what I'm up to once I know it is going to work ;-)