[ltla-umappp|ltla-*] new ports

[moritz-h]

This adds the port ltla-umappp and all required dependencies. I included them in a single PR, because all 6 libraries are using the same project layout, same CMake handling, are all header only and overall relative small libraries without any patches or other edge cases and have many dependencies on each other. I assume reviewing will be very similar for all of them, so maybe it is easier to look at them at once. However, if you want a single port per PR I could split it up.

• 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.

[Adela0814]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Adela0814]

Testing usages.

[Adela0814]

Testing usages.

Tested usage on x64-windows.