Fix definition of ssize_t and off_t.

issue 105: 32-bit version not running on server 2003. Adjusted project settings and selected APIs in use via runtime version checks and windows version macro.

Issue 108: Added 32-bit support back in. QFork code requires a contiguous memory allocation for heap. Due to this requirement and 32-bit memory model limitations, maxheap is limited to about 512MB in 32-bit executable. 32-bit version appears to be about 30% slower than 64-bit version on 64-bit OS.

Moved projects to VS2013. Removed dependency on CRT runtime DLLs. Removed APIBridge.DLL. Added MSOpenTech copyright notices.

Cleaned up duplicate WIN32_IOCP flag in projects. Also added compressOutputToReleaseFolder.ps1 script to release build of Redis.

Using project reference rather than linker library input. This fixes the annoying 'do you want to rebuild the universe just because you pressed F5' problem. Built is now built.

moving win32 specific code into a static lib so that it compiles only once, also some minor code tidying

replacing win32_cow implementation with win32_qfork. replication currently broken, but all other unit tests are working.

Removed x86 and non-IOCP targets in preparation for new qfork implementation. Only supported build henceforth will be x64 with IOCP.

Work in progress. Temporary move towards separate IOCP/non-IOCP builds because of thread state issues. Neither build set is particularily stable at the moment.