version 0.99: armor pickups, bullet hit, finishing touches

version 0.99: armor pickups, bullet hit, finishing touches

* 10 bytes off by optimizing main menu a little
* and optimizations to hiscore name handling saved another 17 bytes!
* score increased by 1 per placed enemy, instead of time (otherwise
   you could just evade bosses for a long time for very high score)
* findpixel optimized (or rather un-unoptimized: restored to original)
# ground fixed again (and optimized for tunnel only)
# prevents exploding more than once (not dieing while inside ground)
* some unneccessary pushes removed
+ final boss also fires moving mines (just up/down-enemies)
* on collision less damage to enemy, more to you (bosses too simple)
* normal pickups will increase armor and shield directly (no [alpha])
+ a large pickup'll appear at the end of a level which will select
   your next upgrade: beamweapon, laser, multiple/tailbeam/up-double
+ a small explosion is displayed when enemy's hit but not destroyed
# _all_ multiples appear at your position at start of level
# bug in selecting multiples fixed (recent bug)
+ getting passed 3rd upgrade (4 pickups) increases score by 250!
- second icon integrated in 5th, first two icons removed (unused now)
* the armor bar is now 5 pixels in height; very visible
# if selecting upgrade or starting level, charge bar wasn't displayed