implement game configuration file

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

third-party/tomlc99/test1/README.md

@@ -0,0 +1,22 @@
+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.