v1.7.5
added v1.x.y to versions tests
versionsTests moved to tests/
improved test-lz4-opt-parser
udated README.md
executables use basic types from util.h
fixed strict aliasing warnings in fasttest
Merge pull request #292 from inikep/dev
util.h and platform.h based on zstd
fuzzer: tests more compression levels
VS project: added setargv.obj
fixed versionsTest