gmapsDistanceTool.js for Google Maps -- Basic library for calculating distance(s) 
	between clicked points 

Required dependencies:
	Google Maps v3+
	jQuery v3+ (older versions have not been tested)
	Bootstrap v5+ (older versions have not been tested)

Install:
	1.  Load gmapsDistanceTool.js after the required dependencies are loaded
	2.  Create a div outside of the Google Map container, eg:
		<div id="map"></div>
		<div id="distanceTool"></div>
	3.  Initiate distance tool after Google Maps object is available, 
	    in this case 'map' is the Google Map object, ie:
		var map = new google.maps.Map(document.getElementById('map'), {});
        var distanceTool = new gmapsDistanceTool(map, 'distanceTool', { default_units: unit });
        unit is a string: meter, kilometer, feet, yard, mile, nm 

HTML Element class/id's used by this library:
	ID's:
		gdtDistanceDiv
		gdtLineDistance
		gdtUnitLabel
	class:
		gdtDistanceUnits
		gdtLineDisplay
	Check to make sure class/id's do not conflict

Use:
	Right-click on map to set initial point.
	Right-click on point to delete a previously set point.
	
Updated:
	2019-Feb-21 -- v0.1.0 -- Epoch
	2019-Mar-03 -- v0.1.1 -- Updated for Boostrap 4 only 
	2020-Oct-19 -- v0.1.2 -- Updated div container instructions
	2021-Aug-02 -- v0.1.3 -- Added top offset option for info window, fixed dropdown for Bootstrap 5 
	2023-May-17 -- v0.1.4 -- Added lat/lon info for all segments 
    2026-May-29 -- v0.1.5 -- Bug fixes, dropped IE11 support, fix opt null guard, fix nm missing break,
                             strict equality cleanup, added default units for options