shotgun techs:
(I haven't done enough testing so let me know if these different shotgun modes aren't balanced)
worm shot
ice-IX shot
foam shot
needle shot
foam lasts much longer on shielded mobs
overall foam damage is reduced about 8%
attacks that drain energy don't work when the player is immune to harm
slime, radiation fields, black holes
energy regen that consumes something (ammo, blocks, power ups) now works when immune to harm
but passive energy regen is still stopped while you are immune to harm
pilot wave field can no longer hit intangible mobs with blocks
it was too annoying that you can't use blocks to move around so I reverted it back
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