implement game configuration file

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

third-party/tomlc99/test1/.gitignore

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+/goworkspace
+/toml-test
+/toml-test-decoder

third-party/tomlc99/test1/README.md

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+How to run the tests
+===
+
+```
+% bash build.sh
+% bash run.sh
+Test: array-mixed-types-arrays-and-ints (invalid)
+
+Expected an error, but no error was reported.
+-------------------------------------------------------------------------------
+Test: array-mixed-types-ints-and-floats (invalid)
+
+Expected an error, but no error was reported.
+-------------------------------------------------------------------------------
+Test: array-mixed-types-strings-and-ints (invalid)
+
+Expected an error, but no error was reported.
+
+129 passed, 3 failed
+```
+
+Note: toml version 1.0 allows mixed types in arrays.

third-party/tomlc99/test1/build.sh

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+#!/usr/bin/env bash
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+export GOBIN=$DIR
+go install github.com/toml-lang/toml-test/cmd/toml-test@latest # install test suite

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 }

third-party/tomlc99/test1/run.sh

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+#!/usr/bin/env bash
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+$DIR/toml-test $DIR/../toml_json