[WIP] Update to Mac OS X 10.10 SDK

Tested Parts
--------------

None :stuck_out_tongue_closed_eyes: 


Untested Parts
--------------

`ArchHooks_MacOSX::DumpDebugInfo()`

- Used `sysctlbyname` to find the Mac OS X version instead of the deprecated `Gestalt`.
    - http://stackoverflow.com/questions/11072804/how-do-i-determine-the-os-version-at-runtime-in-os-x-or-ios-without-using-gesta

`MemoryCardDriverThreaded_MacOSX::Unmount( UsbStorageDevice *pDevice )`

- Updated to use `sync_volume_np` instead of deprecated `PBFlushVolSync`.
    - http://lists.apple.com/archives/carbon-dev/2010/Nov/msg00030.html


Current Issues
-------

`InputHandler_MacOSX_HID::DeviceButtonToChar`

- Used the deprecated function `GetScriptManagerVariable` and `GetScriptVariable`.
    - `GetScriptVariable` is not available anymore.

---

p.s. My schedule is quite cluttered and I don't know if I can finish it or not. Please help if you can. :smile:


@dtinth I want to confirm that removing this code and not replacing it with anything is the right approach.