Add experimental android support

[200sc]

I think we should merge this in after we add instructions for how to set this up, then cut a release with it + windows arm

[codecov-commenter]

Codecov Report

Merging #188 (ebf404b) into master (935dec0) will increase coverage by 0.07%. The diff coverage is 55.00%.

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
+ Coverage   92.60%   92.67%   +0.07%     
==========================================
  Files         141      141              
  Lines        6406     6406              
==========================================
+ Hits         5932     5937       +5     
+ Misses        415      407       -8     
- Partials       59       62       +3     

Impacted Files	Coverage Δ
window.go	66.95% <ø> (ø)
drawLoop.go	62.26% <52.63%> (+11.32%)	:arrow_up:
lifecycle.go	72.05% <100.00%> (ø)
collision/rtree.go	97.90% <0.00%> (-1.40%)	:arrow_down:
event/handler.go	96.66% <0.00%> (ø)
sceneLoop.go	94.38% <0.00%> (+3.37%)	:arrow_up:

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[200sc]

After this is merged, we should open an issue that gomobile init requires a c compiler (although I don't know if we can do anything about it realistically, historically we still make this an issue)

I'll also open an issue that our driver does not respect when the android phone changes orientation.