version 1.0 rc1: minor improvements, laser hit

version 1.0 rc1: minor improvements, laser hit

* armor-bar background, empty upgrades sprites changed
+ shows sprite when laser hits an enemy (his "shield"?)
+ exit-key also quits out of ship selection screen
# fixed direct-quit on death bug (bug since recent optimization)
* armor-bar background changed (more elegant and smaller code)
# "flash" when end-boss spawns mine fixed
+ enemy's y start position can be specified per enemy
* first icon is now laser, second one's bullets (later undone again)
# when bullets selected, upgrade icons won't appear half the time
# remainder pixels in armor bar (appeared after heavy damage) removed
+ your ship's explosion is now also 8 frames (half enemy expl. speed)