Add ScriptLibraryManager and replace raw dlLoad usage in Editor/Game/UI

[Thomas-Chqt]

Motivation

• Centralize dynamic script library loading and symbol lookup into a dedicated manager to avoid scattered dlLoad/function-pointer handling.
• Simplify Editor and Game interfaces by passing a ScriptLibraryManager instead of raw callbacks and raw handles.
• Ensure the shared library remains alive for the lifetime of created script instances so instances remain valid after unload() is called.

Description

• Add GE::ScriptLibraryManager (include/Game-Engine/ScriptLibraryManager.hpp and src/ScriptLibraryManager.cpp) which implements load, unload, isLoaded, listScriptNames, listScriptParameters, and makeScriptInstance and keeps a LibraryHandle alive via shared_ptr so instances keep the library alive.
• Replace direct dlLoad and raw function-pointer fields in Editor with std::optional<GE::ScriptLibraryManager> m_scriptLibrary, and update Editor::reloadScriptLib, startGame, and UI wiring to use the manager.
• Update EntityInspectorPanel to accept a const GE::ScriptLibraryManager* and use it to list scripts and parameters, and display a notice when no library is loaded.
• Update Game to accept a ScriptLibraryManager* and use it in setupScene/setActiveScene to create script instances and populate parameters.
• Remove legacy includes/typedefs and function-pointer members and add necessary headers where appropriate.
• Add/modify unit test tests/Script_testCases.cpp to include ScriptLibraryManager and add a ScriptLibraryManagerTest that verifies the library remains usable for script instances after unload() is called.

Testing

• Ran the script unit tests in tests/Script_testCases.cpp, including ScriptLibraryTest and the new ScriptLibraryManagerTest, and they succeeded.
• Project builds and editor UI paths that list scripts were exercised via unit tests and compilation checks which passed.

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Codex Task