Implement generation of protein step by step (+ support animation)

[#41474445]
Expose translateStepByStep and animateTranslation in Scripting API

[#41474445]

Also update interactive to present them.
Highlight mRNA during translation, improve animation of translation

[#41474445]
Fix and finish deserialize-serialize tests

[#43089109]

Now it's implemented using Mocha and CoffeeScript, it also tests
pairwiseLJProperties equality.
Merge branch 'proteins-engine'
bugfix: don't add old & new tare vals on 2nd tare

IS [#42657705]
Open DG table after export

IS [#43075603]
Remove "50N" designation from force sensor

IS [#43075603]