Add xcode project for building flam3 targets

Squashed commit of the following:

commit 3eec4487644915c162b294a86c031f082c6fcc45
Author: Simon Detheridge <simon@highlyillogical.org>
Date:   Fri Dec 26 07:57:16 2014 +0000

    Fix release preprocessor defines

commit 9c1eda5daf47bd24caf2b304fe37828d884842cd
Author: Simon Detheridge <simon@highlyillogical.org>
Date:   Thu Dec 25 16:39:40 2014 +0000

    Add remaining xcode targets

commit 0e8c09792e8a4fe2071456c21fd881e9c86194fb
Author: Simon Detheridge <simon@highlyillogical.org>
Date:   Wed Dec 24 21:00:52 2014 +0000

    Initial xcode project