Merge draco-7_12_0 back to develop

[keadyk]

Background

• We are working to release draco 7-12

Purpose of Pull Request

• Edit ChangeLog, Release info, environment scripts

Description of changes

• See above
• Will leave WIP until release is complete on most machines (in case edits are needed)

Status

• Reference:
  • Pre-Merge Code Review
  • CDash Status
• Checks
  • Travis/Appveyor CI checks pass
  • Code coverage does not decrease
  • Valgrind test passes
  • Toss3 checks pass
  • Trinitite checks pass
  • Code reviewed/approved, sufficient DbC checks, testing, documentation

[codecov]

Codecov Report

Merging #1141 (d353f7a) into develop (f1fd1b4) will not change coverage.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##           develop   #1141   +/-   ##
=======================================
  Coverage     89.0%   89.0%           
=======================================
  Files          374     374           
  Lines        19263   19263           
=======================================
  Hits         17155   17155           
  Misses        2108    2108           

[keadyk]

@jhchang-lanl and @clevelam , this should be ready for review/merge when you have a chance. The installs are complete, and I will work on updating spack recipes / testing soon.