Add 1/3 and 2/3 (33/66) sizes to responsive dimension utilities #7429

[Timo-Breumelhof]

Summary

Adds 33: 33.33% and 66: 66.66% entries to the $sizes map used by responsive-dimension, generating aperture-w--33, aperture-w--66 (and the h/min-w/min-h/max-w/max-h equivalents) for three-column layouts.

Depends on the ordering fix in #7428 — without it, a md-33/md-66 combo could hit the same override bug.

fixes #7429

[mitchelsellers]

The intention of the default DNN theme is to provide a clean implementation for the basic design needed for the default template and the content that is included within the template.

The default theme, by design, was not built with an overwhelming number of panes, third-party libraries, or any additional elements that are not needed for the basic content.

For those looking for additional design support, more complex pane layouts, etc, are strongly suggested to create a COPY of ths default theme, as any future DNN Upgrades would override any changes made to the default themes.