Upgrade release 4.15.6

[Doug Averch]

Here is the changelog:

v4.15.6 - Sep 09, 2021

   XLr8Object Editor removed the default value

   XLr8Object Editor changed object type from I-Descr to I-Descriptor

   XLr8Object Editor added a new object type call FormOnly used only to build the form

   

v4.15.5 - Sep 02, 2021

   Reordered XLr8Developer prompt verifications options alphabetically.

   XLr8Developer removed prompt verifications File and UpCase

   XLr8Developer added a time option to use Webix time verification 

   

v4.15.4 - Sep 01, 2021

   Added ZipCode to XLr8Developer prompt verification options

   

v4.15.3 - Aug 24, 2021

   Changed getMachineId to use a different value that is not encrypted.

v4.15.2 - Aug 24, 2021   

   Changed isValidMachineId to use getMachineId instead of duplicate code.