Update CMakeLists and start building shared library

[VanderCat]

CMakeLists.txt was formatted poorly, lots of repetition, no flexibility. I refactored it to build shared library (e.g. .dll on Windows or .so on Linux) in order to make it more lightweight. Also projects can use this as a library now

List of changes:

• Added exports
• CMakeLists
  • Removed repetition
  • Renamed all kosinski_ prefixes to just k (kosinski_compress -> kcompress, kosinskim_compare -> kmcompare)
  • Added extra options:
    • Only build library
    • Build kcompare (disabled by default as it's only used for tests)
    • Enable debug information (it's no longer extra files with _d suffix)