Fix server_to_ansys_version

[PProfizi]

Realized the current implementation of the ServerToAnsysVersion map would not give the right answer for 10.0 (it gives 10R0).
Fixed this and refactored to not need to update this version map anymore for each new version.

The only requirement is for DPF to continue only bumping major for new Ansys releases.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.40%. Comparing base (c2e57d6) to head (8312868).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2013      +/-   ##
==========================================
- Coverage   88.46%   88.40%   -0.07%     
==========================================
  Files          89       89              
  Lines       10261    10268       +7     
==========================================
  Hits         9077     9077              
- Misses       1184     1191       +7