OSX and 64-bit compatibility testing

This is just a branch I'm using to try to get as far as possible in compiling things on 64-bit OSX. Up until now, not even one file gets compiled before it errors out. But, the number of errors is diminishing. Currently looking at things like:

```
~/github/aktau/pcsx2/common/src/Utilities/AlignedMalloc.cpp:65:32: error: no matching function for call to 'min'
                memcpy_fast( newbuf, handle, std::min( size, header->size ) )
```