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Substitution model visualizer (#803)

* Add SUBST button

Modify class definitions, instantiations to incorporate SUBST button

Remove SUBST button from controlbar

Create SubstTimeline and SubstVisualizer

Add a SUBST tab to the sidebar

Fix problem with range input not sliding in SUBST visualizer tab

22 march 2019

Remove compile error; confirm can generate code from tree and display

Add functionality to handle slider change

Add SUBST visualizer functionality to maximum extent permissable by current state of SUBST substitutor

Remove excess code and comments left over from testing

Add functionality for SUBST to return the actual correct output in the repl output display

Remove redundant code

Add code to make SUBST slider default to max value

Change SUBST display to automatically update to match slider default value

Add buttons to SUBST timeline to allow for fine-grained control over stepping through substitution

Add checks to disable SUBST timeline control buttons when appropriate

"When appropriate" -> for example, all buttons are disabled when the program has not yet been run, and hence there is nothing to step through; button to go to previous step is disabled when already at first step.

Add code such that SUBST interpreter is only used when the SUBST tab of the sidebar is open

Add keyboard controls to SUBST timeline buttons

Add code to transfer default focus to SUBST slider after program evaluation

Override default behavior of HTML input slider for SUBST

Rationale: default HTML input slider binds up and down to increase and decrease, respectively. This runs counter to the intuition provided by course textbook.

Make SUBST slider inline

Make SUBST slider inline (via sass)

* Fix Playground errors

* Shift useSubst variable location

* Rewrite components to make use of new substituter interface w js slang

* Only use subst interpreter when the subst tab is open

* Run format... (continued)

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