Fix multiple explosion-related problems (#517)
Fix multiple explosion-related problems (#517)

-Corrected offset of records for ExplosionMessages
-The destroyed blocks of an explosion can be changed via the api
-only calculate the ray vectors once

Closes #515
GlowstoneMC/GlowstonePlusPlus,GlowstoneMC/GlowstonePlusPlus,GlowstonePlusPlus/GlowstonePlusPlus,GlowstoneMC/GlowstonePlusPlus,GlowstonePlusPlus/GlowstonePlusPlus,GlowstoneMC/GlowstonePlusPlus,GlowstonePlusPlus/GlowstonePlusPlus,GlowstonePlusPlus/GlowstonePlusPlus