Changes between #102 and #103

#103 (Jun 10, 2024, 1:17:15 PM)

1. Memory: Working testclasses + fixed remaining checkstyle — Kevin / detail
2. Memory: Added Strategies (and folder for them) — Kevin / detail
3. Memory: Added TitFor2Tat + adjusted syso from observer — Kevin / detail
4. Memory: Corrected move checked (index) and null-check in strategies, changed GD winning definition. — jeremy.hesse / detail