fixed 2 bugs: spatial hash system double-inserts and SetSystemSchedule() panic

[codecov[bot]]

Codecov Report

Merging #24 (a62e954) into master (8bcfd95) will increase coverage by 0.76%. The diff coverage is 86.20%.

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   70.10%   70.87%   +0.76%     
==========================================
  Files          48       48              
  Lines        1947     1957      +10     
==========================================
+ Hits         1365     1387      +22     
+ Misses        527      516      -11     
+ Partials       55       54       -1     

Impacted Files	Coverage Δ
v2/collision_rate_limiter_array.go	100.00% <ø> (ø)
v2/event_bus.go	100.00% <ø> (ø)
v2/runtime_limit_sharer.go	87.34% <60.00%> (+8.67%)	:arrow_up:
v2/collision_system.go	83.67% <100.00%> (+0.34%)	:arrow_up:
v2/runtime_limiter.go	87.50% <100.00%> (+0.13%)	:arrow_up:
v2/spatial_hash_system.go	100.00% <100.00%> (ø)
v2/testing_spawn_requests.go	92.45% <100.00%> (+0.96%)	:arrow_up:
v2/world.go	84.65% <100.00%> (+2.11%)	:arrow_up:
v2/geom.go	100.00% <0.00%> (+5.71%)	:arrow_up:
... and 1 more

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