Build success + Docker image ready!

[changh95]

Hey everyone,

At the moment, the code probably won't compile with the latest GCC compiler. It seems like many are struggling to use this package.

I managed to build and run MultiCol-SLAM. So I made a docker image that everyone can use for easier build.

Below url is a fork of MultiCol-SLAM. Look for Dockerfile. If you are unfamiliar with Docker, then check out README.

https://github.com/changh95/MultiCol-SLAM

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It would be great if I can contribute to this repo - but I'm not sure if this repo is being maintained as it's quite old.
@urbste , can I make a pull request to fix the build error and add dockerfile?