Add support for Conan

[baothientran]

Fixes #230

This PR removes most of our git submodules and use conan to install most of our third-party libraries

• Group all of our cmake options into one place for convenience
• Move target helper functions into a separate cmake module ConfigureTarget.cmake
• Remove all third-party libraries that already exist in Conan Center
• Use @jtorresfabra 's ConfigureConan.cmake and find_package() to retrieve third-party libraries from Conan
• Thanks to @jtorresfabra, the CI can now work with and cache Conan correctly

@kring and @jtorresfabra if possible, can you please take a look at it and let me know if I should update anything

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[lilleyse]

Is there a reasonable way to install both the Debug and Release versions of the third-party libraries at configure time on Windows?

cmake_find_package_multi has been working well for us in tilers

There are warnings a link time due to missing PDBs from all the third party libraries. Does Conan not include PDBs in debug builds? That seems odd, and less than ideal.

It might depend on how the package was generated. Which is why it would be better to build third party libraries from source on first configuration, which is related to conan-io/conan#7117.

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