Adding Exception class

[andrsd]

This is to allow the user code to determine which exceptions were produced
by us and which were not.

[codecov]

Codecov Report

Patch coverage: 96.00% and no project coverage change.

Comparison is base (ffcc2ff) 99.83% compared to head (00bd9b7) 99.83%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage   99.83%   99.83%           
=======================================
  Files          12       13    +1     
  Lines         616      618    +2     
=======================================
+ Hits          615      617    +2     
  Misses          1        1           

Files Changed	Coverage Δ
src/exodusIIcppFile.cpp	99.65% <83.33%> (ø)
include/exodusIIcppError.h	100.00% <100.00%> (ø)
src/exodusIIcppElementBlock.cpp	100.00% <100.00%> (ø)
src/exodusIIcppException.cpp	100.00% <100.00%> (ø)
src/exodusIIcppNodeSet.cpp	100.00% <100.00%> (ø)
src/exodusIIcppSideSet.cpp	100.00% <100.00%> (ø)
test/ElementBlock_test.cpp	100.00% <100.00%> (ø)
test/Error_test.cpp	100.00% <100.00%> (ø)
test/File_test.cpp	100.00% <100.00%> (ø)
test/NodeSet_test.cpp	100.00% <100.00%> (ø)
... and 1 more

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