[godot-cpp] Create a new port

[ytnuf]

Fixes #34492

• Changes comply with the maintainer guide.
• The name of the port matches an existing name for this component on https://repology.org/ if possible, and/or is strongly associated with that component on search engines.
• Optional dependencies are resolved in exactly one way. For example, if the component is built with CMake, all find_package calls are REQUIRED, are satisfied by vcpkg.json's declared dependencies, or disabled with CMAKE_DISABLE_FIND_PACKAGE_Xxx.
• The versioning scheme in vcpkg.json matches what upstream says.
• The license declaration in vcpkg.json matches what upstream says.
• The installed as the "copyright" file matches what upstream says.
• The source code of the component installed comes from an authoritative source.
• The generated "usage text" is accurate. See adding-usage for context.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is in the new port's versions file.
• Only one version is added to each modified port's versions file.

Notes:

• This library is static only, so it's only supported for the static triplets.
• Unfortunately, godot-cpp is not yet installable, so I had to patch its cmake script.
  I have made a PR upstream: Make godot-cpp installable with cmake config godotengine/godot-cpp#1418
  But in the meanwhile, I have created an unofficial export target unofficial::godot::cpp.

[ytnuf]

@microsoft-github-policy-service agree

[Cheney-W]

godot-cpp:x64-windows-static install failed with below error:

CMake Error at F:/v/vcpkg-37931/downloads/tools/cmake-3.29.0-windows/cmake-3.29.0-windows-i386/share/cmake-3.29/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
  Could NOT find Python3 (missing: Python3_EXECUTABLE Interpreter) (Required
  is at least version "3.4")

[ytnuf]

godot-cpp:x64-windows-static install failed with below error:

CMake Error at F:/v/vcpkg-37931/downloads/tools/cmake-3.29.0-windows/cmake-3.29.0-windows-i386/share/cmake-3.29/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
  Could NOT find Python3 (missing: Python3_EXECUTABLE Interpreter) (Required
  is at least version "3.4")

@Cheney-W

I'm not entirely sure how to go about this since the python package provided by vcpkg is now broken due to it's dependency on liblzma.

[ytnuf]

I think using vcpkg_find_acquire_program("PYTHON3") instead might be the solution to my conundrum.

[Cheney-W]

Since the upstream does not provide exports, please use the unofficial-godot-cpp as the export file name and use unofficial::godot:cpp as the export target name in the exports you added.

[luncliff]

Port Requested in #34492 ?

[Cheney-W]

Usage test passed with x64-windows-static triplet.

[JavierMatosD]

I'll place the PR in draft. Please mark "ready for review" once you've responded so I know.

[Cheney-W]

Upstream has released the latest version 4.2.2: https://github.com/godotengine/godot-cpp/releases/tag/godot-4.2.2-stable, could you please use the latest version? Thank you!

old