Add ability to compile as a library#6

Notes: * Preserve ability to use as plain sources too. * Add ability to run tests, get rid of hardcoded CodeBlocks project. * Modular library compilation (i.e. user should be able to choose only necessary data structures). * ~Use CMake (halp ;C).~ * Add safe compilation mode that will use `-O2` instead of `-O3`, `-fno-strict-aliasing` etc. since the C standard is utterly retarded but GCC considers it as a honor to follow it. A good example of talking some sense to GCC is here: https://repo.or.cz/k8vavoom.git/blob/08d44a45c7eae3a1bebab49cbb1da4e66f522637:/CMakeLists.txt#l278