capabilities is now a scoped enum

[anarthal]

close #471

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.14%. Comparing base (cbe9270) to head (c07603f).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #473      +/-   ##
===========================================
- Coverage    99.14%   99.14%   -0.01%     
===========================================
  Files          142      142              
  Lines         7280     7278       -2     
===========================================
- Hits          7218     7216       -2     
  Misses          62       62              

Files with missing lines	Coverage Δ
...oost/mysql/impl/internal/protocol/capabilities.hpp	100.00% <100.00%> (ø)
...t/mysql/impl/internal/protocol/deserialization.hpp	97.69% <100.00%> (ø)
...ost/mysql/impl/internal/protocol/serialization.hpp	100.00% <100.00%> (ø)
...sql/impl/internal/sansio/connection_state_data.hpp	100.00% <100.00%> (ø)
...ude/boost/mysql/impl/internal/sansio/handshake.hpp	98.27% <100.00%> (+0.04%)	⬆️

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