switched back to RA explosions.
Until translucent effects are introduced, we should use the RA explosions,
which look better than what we currently have.
devastator gfx; & sonic weapons str. Fire fixed.
added bigboom; made explosions better fits
re-arranged explosions in sequences.yaml for ease
general fix-ups.
re-added old nuke missile, with RA palette (fix)
Merge branch 'd2k-visuals' of https://github.com/psydev/OpenRA into bleed

Conflicts:
	mods/d2k/weapons.yaml