* support for setting a custom playback speed * rename to playback speed old-commit-hash: c5f73a748e6ea9742001d771b96346e3b5eddef9
* mv to tools/replay * change folder * add .gitignore * fix build doc * disable warning * enable warning after build * build qt/util.cc qt/api.cc to library * cleanup old-commit-hash: fd5b3d76036b78864111790931a3abcb1d11ee0f