2.4.2 milestone - Exponent CMS

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Exponent CMS: 2.4.2

Expected: Dec 29th, 2017 | 1 ticket open, 16 tickets total. | Milestone completed on January, 01 08:51 PM

Replace default 'yui' interface with NEW bootstrap/jquery, leaving yui as optional

integrate Twitter Bootstrap v4 support (it's supposedly v3 compatible, but there are some quirks)
'yui' would become a 'hard' framework type like bootstrap & boostrap3
'yui' must be specifically declared in the theme template to receive the 'yui' styling, otherwise it'll default to the NEW style
basically all the current controls, etc...would be moved into a 'yui' subfolder and the NEW style (probably bootstrap3/4) would be moved into the root folder like controls/plugins, etc...)
update events module
remove ancient browser polyfill support? This would only/mostly affect forms which would still be functional. 'Ancient' browser use is strongly discouraged due to the many security failings