refactor: init pacman, ghosts, fruits & timers in main

[jvondermarck]

I think that we can also init pacman, ghosts, fruits & timers here.
Playing a game won't change what is initialized by this function so we can only initialize this once instead of at the start of each game :)

This way, we can initialize theses

Originally posted by @FranckG28 in #76 (comment)

[FranckG28]

I like this issue !

[jvondermarck]

I love it too !!!