Delphi-PRAXiS - Keyboard and Key States Chapter added

Added a new chapter about the keyboard state and the key states for simple key input handling. Updated the Text and Font chapter. It seems the author of p_daniel’s (or danpla’s) SDL 2.0 units has deleted his github account, hence I updated the discussion page about which unit to choose. Also the official website of … <a href="https://www.freepascal-meets-sdl.net/keyboard-and-key-states-chapter-added/" class="more-link">Continue reading <span class="screen-reader-text">Keyboard and Key S