Bomb more user friendly & dodgy code fixed

Found a glitch with the bullets where there was a very small chance
that the ship would stop firing them due to update and fixed update
getting out of sync, but I fixed it so no worries and the reticle makes
it more clear that it’s prompting you to do something now. Also, I’m
adding the mechanism that allows the bomb to only be fired once every x
seconds which is why the bomb icon is in the bottom of the screen but
leave that alone for now :)