v2.1.6c - Updates for jQuery 3.x+

This update removes dependency on some deprecated jQuery functions as of jQuery v3.5.1.

v2.1.6b - Updates for jQuery 3.x+

Fixes applied to update compatibility with jQuery v3.x and above.

Additional code cleanups applied and removal of some unmaintained options (BOWER).

Updates to build and packaging system included.

Release with Updated Files for 2.1.6

Addendum release -- fixes a couple minor bugs - adds one feature revision.