Dumb scripts for making projectiles hitscan (meaning they travel instantaneously).

* hitscan.lua - Fast moving projectiles are hitscan instead of moving at 1 WU/sec.
* hitscan_all.lua - All projectiles, including flamethrower, fists, and monster projectiles have unlimited range and are hitscan.

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Hitscan script by W'kncacnter, ray_to_line_segment function provided by Treellama.