[PATCH 0 of 1] Enhancement: Repo browser quick action icons

[Ross Thomas]

This replaces the previously submitted patch changeset: 504adebdb501
  <https://lists.sfconservancy.org/pipermail/kallithea-general/2020q1/003093.html>

It changes the names that were identified as too generic.
It also fixes and refines the configurable nature of the enhancement.

It does NOT implement any of the other UI changes still under discussion in that thread.  This is just a cleanup of the prior patch to ensure it is 'correct'.