finish typescript conversion

_lib/collections/ItsLayerCollection.js

_lib/collections/LayerLegend.js

_lib/collections/Sliders.js

_lib/domUtil/SelectBoxBase.js

_lib/gulp-helpers.js

_lib/jquery-plugin/animate-buttons.js

_lib/jquery-plugin/day-range.js

_lib/jquery-plugin/range-change.js

_lib/jquery/floatthead.js

_lib/jquery/jquery-layout.js

_lib/jquery/jquery-ui.js

_lib/jquery/jquery.js

_lib/layers/LayerBase.js

_lib/layers/LayerBaseVector.js

_lib/layers/LayerBaseVectorEsri.js

_lib/layers/LayerBaseVectorGeoJson.js

_lib/layers/LayerBaseXyzTile.js

_lib/layers/LayerEsriMapServer.js

_lib/layers/LayerEsriTile.js

_lib/layers/LayerItsInventory.js