Changes

• Single POSIX target (MacOS support dropped, Windows is supported by emulating missing pices)
• GC dropped
• Enhanced bridging (each CF class is bridged to 2 NS classes: mutable and immutable)
• Reference counter moved to CFRuntimeInstance (LP64 model)
• Source cleanup (redundant #ifdefs removed, non-public code removed)
• Source formatted according to Coding Style
• CFAllocator is malloc_zone_t compatible (from itoa-macemu project)
• Validation mechanism which either asserts (when CF is used alone) or throws exceptions (when used with Foundation)
• etc.