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No functional changes.
- add `override' everywhere where missing
- almost pass clang's `-Wweak-vtables'
- avoid some float/double conversions
- remove unused private members
- make signedness conversions explicit
- put stuff in right namespaces to aid analysis
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Rename traits' functions to be more explicit.
Most of the changes are pretty old and I can't read
them at this time, sorry.
Adjust usages.
Issue: #825
Reported-by: @DanielKinsman
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1. Calling valueChanged didn't invoke machinery in
   value<t>, only base_value aka value_.
   There's a fast path in value<t>::type() despite the
   pessimization.
2. Split global scope stuff into options::globals from
   the options::globals stuff
3. Adjust usages
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