Add 2.8.0 changelog and update credits

[phoerious]

Adds the 2.8.0 changelog and update About credits.

To be merged later when all 2.8.0 PRs are finalised.

Type of change

• ✅ Documentation (non-code change)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.14%. Comparing base (5d7f371) to head (be5f684).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #13683      +/-   ##
===========================================
- Coverage    63.14%   63.14%   -0.00%     
===========================================
  Files          388      388              
  Lines        41120    41120              
===========================================
- Hits         25963    25962       -1     
- Misses       15157    15158       +1     

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