Tank game updates:
- Slightly update TODO.txt.
- The times a bullet can hit a wall can now be specified (hardcoded, too) in the constructor (also known as lifes).
- Enemies now attempt to shoot at the player randomly when shooting from the current angle would result into the bullet hitting the player. This also takes in consideration hitting the wall once.
- It is no longer possible to shoot a bullet if it already collides with a wall on the position it gets spawned.
- Landmines properly count work again.
Tank game updates: Update TODO.txt.