Merge pull request #5304 from duboisp/table-v4.0

HTML Table Validator
Core: Add GUID method

Replace separate random ID generators with a single implementation.
Having a single stub-able method will make it easier for testing.
Slider polyfill: Standardized event handling to address Android issues (fixes #5300)
Merge pull request #5316 from pjackson28/fixslidervalue

Slider polyfill: Standardized event handling to address Android issues (fixes #5300)
Added same margin top to h1 as to h2 (fixes #5211)
Documentation: Changed Accolades page to Awards, articles and videos (fixes #5237)
Merge pull request #5317 from pjackson28/settopmarginh1

Added same margin top to h1 as to h2 (fixes #5211)
Merge pull request #5318 from pjackson28/changeaccolades

Documentation: Changed Accolades page to Awards, articles and videos (fixes #5237)
Updated references to awards, articles and videos page
Merge pull request #5319 from pjackson28/changeaccoladesrefs

Updated references to awards, articles and videos page
Merge pull request #5315 from nschonni/wb-guid-method

Core: Add GUID method
Overlay: Push element onto GPU

Prevents repaints as the page scrolls
Merge pull request #5321 from nschonni/overlay-translatez

Overlay: Push element onto GPU
Table validator: Cleaned up the English grammar
Merge pull request #5325 from pjackson28/tablevalidcleanupenglishgrammar

Table validator: Cleaned up the English grammar
Rename files to align with Bootstrap viewports

- Moved the Calendar theme file as it wasn't referenced before
- Renamed core SCSS files to `_base.scss` except for the polyfills that are supposed to output
- Renamed print view to `_print.scss` and `_print-ie8.scss`
- Rename IE8 fallbacks to `_ie8.scss`
- Combined the Details/Summary bases that where in src/base with the polyfill's SCSS
Merge pull request #5312 from nschonni/rename-camel-case-scss

Rename files to align with Bootstrap viewports
Multimedia: Rename and add Print SCSS

Renaming was missed in previous PR as the file was not referenced
Split up details/summary CSS overrides from details/summary polyfill pre-Modernizr CSS
Merge pull request #5326 from nschonni/rename-and-add-multimedia-print

Multimedia: Rename and add Print SCSS