Method deselect

docs/app/js/sanddance-app.js:9909–9916

* Removes any selection.

()

    /**
     * Removes any selection.
     */ deselect() {
        return new Promise((resolve, reject)=>{
            this._animator.deselect().then(()=>{
                this._details.clearSelection();
                resolve();
            });
        });
    }
    /**
     * Gets the current selection.
     */ getSelection() {