Errors encountered while generating Python bindings

[mattparks]

Based on feature/arm commit a46472c.
Tested on Ubuntu 20.04, clang-17, --std=20, libstdc++.

1. std::hash template specialization

#include <cstdint>
#include <functional>

namespace test {

struct Index {
    constexpr operator uint64_t() const noexcept {
        return 0U; /* Implementation detail */
    }
};

}  // namespace test

namespace std {

template<>
struct hash<test::Index> {
    size_t operator()(const test::Index index) const noexcept {
        return std::hash<uint64_t>()(index);
    }
};

}  // namespace std

[Tolc][error]: Failed to find template declaration for template specialization "std::hash<struct test::Index>". Did it appear before the specialization in the source?
[Tolc][error]: Error reported from Parser

2. Non-overloaded operator

#include <cstdint>

namespace test {

struct ID {
    constexpr operator uint64_t() const noexcept {
        return 0U; /* Implementation detail */
    }
};

}  // namespace test

[Tolc][error]: Unsupported operator "test::ID::operator unsigned long"
[Tolc][error]: Error reported from Parser

Note: binder supports a few extra operators, this has proven useful: https://github.com/RosettaCommons/binder/blob/master/source/function.cpp#L48

3. Templatized struct member variable

#include <random>

template <class I>
struct Demo {
    std::uniform_real_distribution<I> _distribution;
};

[Tolc][error]: Failed to parse member variable "Demo::_distribution"
[Tolc][error]: Error reported from Parser

4. Templatized struct function return type

template<class T = float>
struct unit {
    friend constexpr unit operator+(const unit lhs,
                                    const unit rhs) {
        return unit{lhs.val + rhs.val};
    }

    T val;
};

[Tolc][error]: Failed to parse return type "unit<T>" for function "operator+"
[Tolc][error]: Error reported from Parser

5. Portability concern

Building the tolc executable can be done from one machine, and binding executions could be done on a different machine with a difference in paths.
https://github.com/Tolc-Software/tolc/blob/feature/arm/src/Parser/Helpers/commandLineArgs.cpp#L13 using -nostdinc++ could cause issues.
Here's another instance of baked in system specific paths: https://github.com/Tolc-Software/tolc/blob/feature/arm/src/TolcInternal/getSystemIncludes.cpp.in#L25