Android multitouch events support

[nodoteve]

AndroidApplication::inputEvent() rework mainly

[codecov]

Codecov Report

Merging #527 (2b8387c) into master (2347a7f) will increase coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #527      +/-   ##
==========================================
+ Coverage   79.86%   79.99%   +0.12%     
==========================================
  Files         511      511              
  Lines       31599    31797     +198     
==========================================
+ Hits        25238    25435     +197     
- Misses       6361     6362       +1     

Impacted Files	Coverage Δ
src/Magnum/Math/Matrix3.h	98.56% <0.00%> (-0.19%)	⬇️
src/Magnum/PixelFormat.h	100.00% <0.00%> (ø)
src/Magnum/Math/Matrix4.h	100.00% <0.00%> (ø)
src/Magnum/Trade/AbstractImporter.h	100.00% <0.00%> (ø)
src/Magnum/Text/AbstractFontConverter.h	100.00% <0.00%> (ø)
src/Magnum/Trade/AbstractImageConverter.h	100.00% <0.00%> (ø)
src/Magnum/Trade/AbstractSceneConverter.h	100.00% <0.00%> (ø)
src/Magnum/ShaderTools/AbstractConverter.h	100.00% <0.00%> (ø)
...agnumPlugins/AnySceneConverter/AnySceneConverter.h	100.00% <0.00%> (ø)

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