feat: reimplement highlight row, node-extend also fixes #1332, #1333

[ghiscoding]

• fixes All items in grid appear highlighted after adding an item to the grid #1332, Incorrect dataContext is passed in onSave callback using composite editor #1333
• possibly (and hopefully) fixes Polyfills ERROR TypeError: Function.prototype.toString requires that 'this' be a Function at Boolean.toString (<anonymous>) #1334 by using the new reimplementation of node-extend that is used for merging grid options and other sections of Slickgrid-Universal object merging & extending

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (87766e9) 100.00% compared to head (cf7e6b1) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1337   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          895       896    +1     
  Branches       302       302           
=========================================
+ Hits           895       896    +1     

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