Basic animation import in glTF

[mosra]

Depends on mosra/magnum#191. Things to do:

• Importing separate TRS as such and not as a single transformation matrix
• Importing node animation data
• Cubic Hermite Spline import postponed after merge
• Verifying this on a bunch of real-life glTF models (from experience, having just handcrafted test data was not a good idea at all)
• remove the animation branch from CI setups after the Magnum part is merged into master

At the moment, this won't cover skinning or morph targets.

[codecov-io]

Codecov Report

Merging #46 into master will increase coverage by 0.28%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
+ Coverage   88.67%   88.96%   +0.28%     
==========================================
  Files          41       41              
  Lines        4045     4149     +104     
==========================================
+ Hits         3587     3691     +104     
  Misses        458      458

Impacted Files	Coverage Δ
.../MagnumPlugins/TinyGltfImporter/TinyGltfImporter.h	100% <ø> (ø)	⬆️
...agnumPlugins/TinyGltfImporter/TinyGltfImporter.cpp	91.94% <100%> (+1.84%)	⬆️

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[mosra]

Merged! 🎉