Properly invalidate if required attribute/property changes

[KaneFreeman]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

Current InputValidity meta and validity middleware do not invalidate when the required status of a field changes. This results in an outside trigger being required before the correct validity is captured.

This change, which is breaking, takes the expected required value and compares it to the required attribute on the HTMLFormElement node. If they do not match, it invalidates (same behavior as when the values do not match).

[codecov]

Codecov Report

Merging #546 (15b22a7) into master (1626e35) will increase coverage by 0.00%.
The diff coverage is 98.03%.

@@           Coverage Diff           @@
##           master     #546   +/-   ##
=======================================
  Coverage   97.43%   97.43%           
=======================================
  Files         117      117           
  Lines        6513     6515    +2     
  Branches     1479     1479           
=======================================
+ Hits         6346     6348    +2     
  Misses        167      167           

Impacted Files	Coverage Δ
src/testing/mocks/middleware/icache.ts	92.85% <92.85%> (ø)
src/core/WidgetBase.ts	100.00% <100.00%> (ø)
src/core/meta/InputValidity.ts	100.00% <100.00%> (ø)
src/core/middleware/focus.ts	100.00% <100.00%> (ø)
src/core/middleware/icache.ts	100.00% <100.00%> (ø)
src/core/middleware/validity.ts	100.00% <100.00%> (ø)
src/core/vdom.ts	98.92% <100.00%> (ø)
src/routing/ActiveLink.ts	100.00% <100.00%> (ø)
src/routing/Router.ts	100.00% <100.00%> (ø)
... and 4 more

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