Version 3.4.0.20240727

• Introduced C++ API (namespace emscripten::glfw3) included with GLFW3/emscripten_glfw3.h:
  • provides a more correct API with sensible defaults (ex: std::string_view / std::optional<std::string_view>
    vs char const * which may or may not be nullptr)
  • allow for C++ only API (ex: std::future)
  • the C API is still available if you would rather stick to it
• Implemented emscripten::glfw3::GetClipboardString (C++ only) which provides a way of fetching the global
  clipboard in a browser environment (glfwGetClipboardString is not the right API due to the asynchronous nature
  of the underlying platform API).
• The cursor position is no longer clamped to the window size, and as a result, can have negative values or values
  greater than the window size.
  Note that GLFW implements a similar behavior on the macOS desktop platform.
• Implemented glfwSetWindowPosCallback
• Added support for GLFW Window Attribute GLFW_HOVERED
• Fixed #6: emscripten_glfw_make_canvas_resizable does not clean up properly.
• Fixed an issue with opacity: when using opacity, the handle is not working unless its z-index is higher than the
  canvas z-index