Loading screen template (#3537)
* initial trial
* Add onInitialDrawComplete
* Add docs
* Add to eventListeners examples
* Keeping things DRY
* Remove callback insertion
* Remove call
* Add initial loading screen
* Fix real initial draw call
* Remove activateOnInitialDraw method
* Add loading screen option
* Add docs
* Remove onInitialDrawComplete double doc
* Simplify example
* Simplify stressPerformance example
* Remove extra line
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