things that go kaboom
adjust bubble height according to unit height.
fix small palette issue
ExplosionBState: extend duration past explosion-end

- to grant a few extra cycles for visuals to dissipate.
- also, tweak out & tidy expL animations.
- plus, 1xp for melee swing; 2xp for melee hit
Map: preReveal needed tweaking as well ...
NextTurnState: delete _timer only if it exists

Merge branch 'master' of https://github.com/SupSuper/OpenXcom into oXc_kL
Conflicts:
	bin/data/Ruleset/Xcom1Ruleset.rul
	src/Battlescape/Explosion.cpp
	src/Battlescape/Explosion.h
	src/Battlescape/ExplosionBState.cpp
	src/Battlescape/Map.cpp
	src/Battlescape/ProjectileFlyBState.cpp
	src/Resource/ResourcePack.cpp
	src/Resource/ResourcePack.h
	src/Resource/XcomResourcePack.cpp
	src/Ruleset/Ruleset.cpp