Add standalone exe build tooling under scripts/exe

build_exe.py compiles every unit in data/compile.json with the pinned toolchain and links Ragexe.exe.
Not part of the decompilation and not in data/compile.json: imports/*.def (original DLL import tables),
jsoncons/ (v0.170.2 headers + JsonCppLoader glue), nProtect/GameGuard.cpp (no-op GameGuard stand-in).

scripts/exe/jsoncons/include/jsoncons_ext/jsonpointer/jsonpointer_error.hpp

@@ -0,0 +1,119 @@
+// Copyright 2013-2023 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSONCONS_JSONPOINTER_JSONPOINTER_ERROR_HPP
+#define JSONCONS_JSONPOINTER_JSONPOINTER_ERROR_HPP
+
+#include <jsoncons/json_exception.hpp>
+#include <system_error>
+
+namespace jsoncons { namespace jsonpointer {
+
+class jsonpointer_error : public std::system_error, public virtual json_exception
+{
+public:
+    jsonpointer_error(const std::error_code& ec)
+        : std::system_error(ec)
+    {
+    }
+    jsonpointer_error(const std::error_code& ec, const std::string& what_arg)
+        : std::system_error(ec, what_arg)
+    {
+    }
+    jsonpointer_error(const std::error_code& ec, const char* what_arg)
+        : std::system_error(ec, what_arg)
+    {
+    }
+    jsonpointer_error(const jsonpointer_error& other) = default;
+
+    jsonpointer_error(jsonpointer_error&& other) = default;
+
+    const char* what() const noexcept override
+    {
+        return std::system_error::what();
+    }
+};
+
+enum class jsonpointer_errc 
+{
+    success = 0,
+    expected_slash = 1,
+    index_exceeds_array_size,
+    expected_0_or_1,
+    invalid_index,
+    key_not_found,
+    key_already_exists,
+    expected_object_or_array,
+    end_of_input,
+    unexpected_end_of_input,
+    argument_to_unflatten_invalid,
+    invalid_flattened_key,
+    invalid_uri_escaped_data
+};
+
+class jsonpointer_error_category_impl
+   : public std::error_category
+{
+public:
+    const char* name() const noexcept override
+    {
+        return "jsoncons/jsonpointer";
+    }
+    std::string message(int ev) const override
+    {
+        switch (static_cast<jsonpointer_errc>(ev))
+        {
+            case jsonpointer_errc::expected_slash:
+                return "Expected /";
+            case jsonpointer_errc::index_exceeds_array_size:
+                return "Index exceeds array size";
+            case jsonpointer_errc::expected_0_or_1:
+                return "Expected '0' or '1' after escape character '~'";
+            case jsonpointer_errc::key_not_found:
+                return "Key not found";
+            case jsonpointer_errc::invalid_index:
+                return "Invalid array index";
+            case jsonpointer_errc::key_already_exists:
+                return "Key already exists";
+            case jsonpointer_errc::expected_object_or_array:
+                return "Expected object or array";
+            case jsonpointer_errc::end_of_input:
+                return "Unexpected end of input";
+            case jsonpointer_errc::unexpected_end_of_input:
+                return "Unexpected end of jsonpointer input";
+            case jsonpointer_errc::argument_to_unflatten_invalid:
+                return "Argument to unflatten must be an object";
+            case jsonpointer_errc::invalid_flattened_key:
+                return "Flattened key is invalid";
+            default:
+                return "Unknown jsonpointer error";
+        }
+    }
+};
+
+inline
+const std::error_category& jsonpointer_error_category()
+{
+  static jsonpointer_error_category_impl instance;
+  return instance;
+}
+
+inline 
+std::error_code make_error_code(jsonpointer_errc result)
+{
+    return std::error_code(static_cast<int>(result),jsonpointer_error_category());
+}
+
+}}
+
+namespace std {
+    template<>
+    struct is_error_code_enum<jsoncons::jsonpointer::jsonpointer_errc> : public true_type
+    {
+    };
+}
+
+#endif