Add support for conan

[baothientran]

This PR is used to accommodate the conan support PR for cesium-native

• Instead of hardcode the absolute library name, I just check if the file paths in the third-party directory contains the library name. If it does, then we will use that lib path for unreal plugin. That is because in Conan, the name of the library is inconsistent. For example, tinyxml2 library can have the same name tinyxml2.lib for both debug and release build. However, spdlog can have spdlogd.lib for debug and spdlog.lib for release.
• Remove the third-party directory whenever we do cmake install cesium-native. That prevents the above solution mixes debug and release build together
• Add fmt lib to unreal since conan spdlog depends on it

TODO:

• [ ] Fixes CI build to install conan

[cesium-concierge]

Thanks for the pull request @baothientran!

• :heavy_check_mark: Signed CLA found.

Reviewers, don't forget to make sure that:

• [ ] Cesium for Unreal Samples works.

[cesium-concierge]

Thanks again for your contribution @baothientran!

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[cesium-concierge]

Thanks again for your contribution @baothientran!

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[cesium-concierge]

Thanks again for your contribution @baothientran!

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[cesium-concierge]

Thanks again for your contribution @baothientran!

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[cesium-concierge]

Thanks again for your contribution @baothientran!

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[cesium-concierge]

Thanks again for your contribution @baothientran!

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[cesium-concierge]

Thanks again for your contribution @baothientran!

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[cesium-concierge]

Thanks again for your contribution @baothientran!

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[csciguy8]

Closing this draft PR due to its age. (over 1 year of inactivity).

From discussions with @kring, integrating conan was fairly difficult due to timing between conan versions and due to the framework itself. Ultimately, robust dependency management is still needed for both this repo and cesium-native, whether we use the latest conan version, VCPKG, or some other solution.