Adds *Space ReindexShape (#39)

fix #33 NaN prevention not working

Merge pull request #30 from setanarut/master

Fixes (go-staticcheck problems)

fix #24 crash when using spatial hash

fix #23 implement shape query

shape: Add support for setting mass/density on Shapes (#19)

Merge pull request #17 from gabstv/nodestroy

Fixes BBTree NodeFromPool() and removes ObjectiveC `Destroy()` methods

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