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Fixes #9925: convert font data to base64, fixing 0xefbfbd (Unicode Replacement Character) chars in customizer fonts.

Merges #9982
trivial refactor in build-customizer grunt task
fix #10805
Convert "Recess" to "RECESS"

Except when speaking of the "recess" Node package, RECESS should be in all-caps.
Merge pull request #10956 from ZDroid/patch-4

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upgrade holder.js to v2.1
re-remove execute permissions; apparent upstream bug