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Main changes for QuantLib-SWIG 1.34

More details on the changes are available in ChangeLog.txt and at https://github.com/lballabio/QuantLib-SWIG/milestone/27?closed=1.

Upgrade to SWIG 4.2.x. This allows to use Python's limited API and thus reduce the number of official wheels to cover the same Python versions.
Allow swaptions to use OIS as underlying (@lballabio).
Pass explicit base date to inflation curves instead of observation lag (@lballabio).
Exported SavedSettings as a context manager in Python; thanks to Eugene Toder (@eltoder).
Exported parabolic (Hermite) cubic spline interpolation schemes; thanks to Marcin Rybacki (@marcin-rybacki).
Exported additional interpolation schemes for InterpolatedPiecewiseZeroSpreadedTermStructure; thanks to Marcin Rybacki (@marcin-rybacki).
Exported Tona index; thanks to Jonghee Lee (@nistick21).
Removed inflation index constructors with interpolated parameters as well as the interpolated method in InflationIndex. They're no longer available in C++ (@lballabio).
Export a few new methods for MakeOIS and MakeVanillaSwap; thanks to Eugene Toder (@eltoder).
Exported cdsMaturity function (@lballabio).
Enable different definition of macro QL_JAVA_INTERFACES; thanks to Ralf Konrad (@ralfkonrad).
Define a few additional operators in C++ instead of Python; thanks to Eugene Toder (@eltoder).
Removed uncallable internal EndCriteria::operator() method (@lballabio).

Full Changelog: v1.33...v1.34