Custom TOC div for wildfire related layers

Created a custom Div in the Layer Legend to add another group to the
Table of Contents (TOC) for wildfire related layers.  I had to create a
custom Div so that I could have feature layers from multiple sources in
one group.
Images for custom wildfire TOC div

I made custom symbology png's for each of the wildfire layers I added
and the hunt area query layer.
Toggle Wildfire Layers On/Off

Added code to check/uncheck the wildfire layers checkboxes and toggle
those layers on/off.