Update Energy2D XML->JSON conversion, create JSONs similar to other models

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Update Energy2D Makefile, built config, dependencies

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Add new group to Lab interactives - Energy2D

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Add basic implementation of Energy2D Lab-specific view and controller
Support new model type in Interactives Controller

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Fix Energy2D interactive controller

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(should be depreciated soon)
Define Energy2D metadata

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Implement Energy2D model controller

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Implement Energy2D modeler consistent with rest of the framework

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Do not validate options in Energy2D core model

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Implement Energy2D model container

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Do not validate options in Energy2D view, use scalable fonts

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Update Energy2D tests after changes

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Simplify Lab controllers

Move merging of model options with interactive options to
InteractiveController.
Fix legacy Energy2D page (still useful for tests)

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Add timeStepsPerTick option to Energy2D model

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generate Lab Interactives for energy2d from template

./imports/energy2d/convert-to-json.rb

generated resources will appear in next commit
generated Energy2D Lab Interactives and models

./imports/energy2d/convert-to-json.rb
Energy2D: enable Interactive Browser keyboard handling
update path to energy2d.jar in original pages

Now the original Energy2D models can be run at urls like this:

http://localhost:9292/imports/energy2d/content/solar-heating-convection.html