Tetrois (Console Tetris)

I updated the replay mechanism, you can now press space to play again. In addition, some code clean up was done, and i noticed that the time has been tracked in two different Hackatime project (opsi). Nevertheless, here is a better explanation why I switched to Ncurses (effectivly dropping Windows support):
In the initial C++ version, rendering was a manual battle against screen flicker. You had to calculate terminal dimensions using ioctl, manually position the cursor and manage color states with ANSI codes. To prevent the screen from strobing every frame, the code relied on a custom “line-diffing” algorithm that only updated lines that had actually changed. This worked, but it was brittle. If the terminal resized or if a single character was miscounted, the entire layout would shatter. That is completely gone with the new Ncurses version.