[sdl2pp] Update to 0.16.1 and fix find_package error

[LilyWangL]

Describe the pull request

• What does your PR fix? Fixes [SDL2PP] How do I build SDL2PP? #13271
  Sdl2pp provide FindSDL2PP.cmake, add vcpkg-cmake-wrapper.cmake to set CMAKE_MODULE_PATH. Fix find_package(SDL2PP REQUIRED) error:

By not providing "FindSDL2PP.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "SDL2PP", but
  CMake did not find one.

  Could not find a package configuration file provided by "SDL2PP" with any
  of the following names:

    SDL2PPConfig.cmake
    sdl2pp-config.cmake

[BillyONeal]

I'm unsure about the vcpkg_cmake_wrapper for the same reasons as in #14292, I asked some other folks to comment.

[BillyONeal]

@JackBoosY It probably doesn't require the author to respond, only a more competent vcpkg maintainer than I