Implemented changing the step icon based on the student work status for
the step.
Fixed a problem with the Edit Info button not working in the authoring
tool.
updated look, builder bug

changed looks (inspired by Camillia),
Bug: when user tries to place a block that has already been set, but now
is marked in red did not replace correctly.
Fixed some problems with authoring idea baskets in the Edit Info section
of the authoring tool.
Merge branch 'master' of https://github.com/WISE-Community/WISE-VLE
Revise Models

Now can revise models if the builder is of the same type as the model.
Tag map function: density from table

Now includes a tag mapping function that will take a value from a table
and apply it as the density to all materials in the step.
Added AggregateView support using TagMaps. Refactored code related to rendering summary view in the classroom monitor tool so we can reuse it in the AggregateView for students. Works when trying to show aggregate view from MC step in OR step.
Added minor improvements to the table step in the authoring and the vle.
Merge branch 'master' of https://github.com/WISE-Community/WISE-VLE
added zh_CN to VLE's supported locales
Library can be omitted

For use in "empty world" where objects are directly placed into the
world, don't need a library.  This option in the template can eliminate
a non-functional library.
Updated Cargraph step

Now the cargraph step can be applied to graphs with large y-values
(previously one tick per unit, now 1 tick per X units).
box2d save only when box2dModel defined

this is an error that occurs everywhere
Cargraph ui change in setup

Problem with current 1.10 version of jquery-ui, using an older version.
changed double quotes to single quotes in i18n_en_US.json as it was breaking the translation form tool
new translations for dutch and simplified chinese
Implemented authoring for step icons. Also moved changing of step icon
logic into the navigation panel.
Merge branch 'master' of https://github.com/WISE-Community/WISE-VLE
sensor and cargraph easyClickExtremes

Now option in graphParams of sensor and cargraph, easyClickExtremes,
broadens the width of the graph allowing students to precisely create a
point at the min and max x value.