V3 Rename row-contents blades

[lrljoe]

Renaming blades from row-contents to collapsing-columns to improve maintainability and help understanding of structure

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• Have you followed the guidelines in our Contributing document?
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New Feature Submissions:

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Changes to Core Features:

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[codecov]

Codecov Report

Merging #1519 (3972e89) into develop (03a19f0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1519   +/-   ##
==========================================
  Coverage      88.55%   88.55%           
  Complexity      1256     1256           
==========================================
  Files             95       95           
  Lines           2980     2980           
==========================================
  Hits            2639     2639           
  Misses           341      341