Fix a regression where the tick length was inadvertently set to 16 ms instead of 50.

Increase damage done by missiles.

Changes:

• Smoother animations of positions between game ticks in the UI.
• Improved UI performance.
• Added command line arguments for automated testing.
• Make it possible to disable most graphical effects for running on potato-equivalent systems.
• Change the reported rotation of the Missile to match the one for Player.
• Add a countdown before starting rounds.
• Sort players by score on the end screen.
• Store results in a results.txt file when game is over.
• Update NodeJS example so it actually works.
• Improve compatibility with old versions of Qt.

Thanks to tapped, Kwark and Zomgtronics for code and feedback.

THANKS TO JoMs FOR BEING MVP