Alpha Update #2

+ Added Richard's Jesen and Nig sprites + animations
+ Made Jesen HUGE AS FUCK
+ World now scrolls infinitely and deletes tiles that go off-screen to
the left to conserve memory and processor speed
+ Background scrolls slower for parallax effect
+ Added new parent object that is parent of collision object that does
the same things as obj_collision but scrolls left
+ Game now restarts when "R" is pressed
- Added exported tileset images of Jesen_Flow.pyxel and Nig_Run.pyxel
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