implement game configuration file

this integrates https://github.com/cktan/tomlc99 into the repo as a dependency

third-party/tomlc99/test1/extra/array_of_tables.toml

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+x = [ {'a'= 1}, {'a'= 2} ]

third-party/tomlc99/test1/extra/inline_array.toml

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+x = [1,2,3]

third-party/tomlc99/test1/extra/inline_table.toml

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+x = {'a'= 1, 'b'= 2 }