* Adds RDAny (smaller generic holder) Updates all used dictionaries
This is an API compliant version of the current rdany system,
but uses a lot less memory in practice.
* Removes code duplication
* Converts CHECK_INVARIANT to TEST_ASSERT
* Fixes DoubleTag issue
* Adds Bool to DoubleMagic implementation
* Removes reference to property pickler
remove const specifiers from return values in DataStructs
add initial pass at query-query matching for Atoms and Bonds
fix and test for sf.net issu 2738320
add Mol.AddRecursiveQuery() method to Mol