new zlib, better CMake integration, code fixups 

Improvements:
 - zlib version 1.2.8 now part of the project
 - actually compiles when using a project generated by CMake for VS2013
 - CMake integration was almost completely rewritten, DLLs from VS now have names recognized by CascLib.h for automatic inclusion
 - fixed the few warnings that were generated
 - generated files are now put into a sane folder structure. Intermediate files, sadly, arent.
 - export functions from DLLs (ie. actually generate an import library for CascLibXYZ.dll)

Potential Problems:
 - no more INSTALLing with CMake. I dont see a problem with reintroducing this at a later date, i just cant think of a good way at the moment.
 - support for Linux and Mac in CMake is lacking, mostly due to my unfamiliarity with the OSs and GCC/CLang (or really any compiler other than VS). Someone with more knowledge about those platforms should give this a closer look, it probably doesnt work too well.