Move source dirs to src/ (#740)

Move source dirs to src/ (#740)

* Move source dirs to src/

Move assets to assets/Client/ and assets/Server/
Move tools under src/Tools/
Move N3Base up a level (src/N3Base/)

As we now have an increasing number of non-source paths in the root dir, the layout is becoming increasingly unmaintainable, especially for tools like Doxygen or clang-format which need to evaluate appropriate directories.

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