This refactors Sort, Term, Op and datatype objects to not maintain a
reference (and depend) on Solver, but an associated NodeManager. This
allows to share node managers between solver instances.
mkFunctionSort that takes two sorts as arguments is redundant, because
the first argument is equivalent to a vector of size one passed to the
other overload of mkFunctionSort. This commit removes the method from
the C++ API but keeps the existing semantics for the Java and Python
bindings for convenience and consistency with, e.g. mkTerm.
The public cvc5 API now lives in the cvc5 namespace. All internal parts were moved into the (new) internal namespace.
The final hierarchy will be as follows:
cvc5
~~ public API
::context
::internal
::parser
::main
After this PR it will be:
cvc5
~~ public API
::internal
::context
::main
::parser
