Update superboxselect.js to version 1.6 and add HTML entity encoding

[matdave]

What does it do?

Updates superbox select to the latest version from Dan Humphrey (which is still old, just newer). I've also added an htmlEncode function to the value and display fields, so they do not break the manager if you use special characters.

Why is it needed?

Using special characters in the value or display field of the superbox select can lead to broken functionality.

How to test

The easiest way to test is to create a multi-list TV and add special characters to the values. For my testing I was having the most issues with ", &, and < characters in various combinations. If you test the output and save before and after this fix, you will find that the output and the stored results are not what you put in. After this fix, the output and stored results will match your options.

Related issue(s)/PR(s)

Found while working on a client site.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.53%. Comparing base (b1a02c3) to head (2e2fb1d).
Report is 17 commits behind head on 3.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                3.x   #16702      +/-   ##
============================================
- Coverage     21.53%   21.53%   -0.01%     
+ Complexity    10734    10733       -1     
============================================
  Files           565      565              
  Lines         32540    32542       +2     
============================================
  Hits           7007     7007              
- Misses        25533    25535       +2     

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[theboxer]

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