added AlternativeScreen , removing bullet after it hits enemy or fuel

[6arare]

executing the game in the AlternativeScreen so the state of the terminal remains unchanged after quitting the game also removing the bullet from bullet index using pop() bcz using remove(index) will cause in panic

[panoschagias]

bullets are not supposed to be removed after hitting an enemy. that's why their symbol was changed, to indicate their power.

[6arare]

ahh ok didnt know that