implement game configuration file

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

third-party/tomlc99/stdex/arrtab2.toml

@@ -0,0 +1,19 @@
+[[fruits]]
+name = "apple"
+
+[fruits.physical]  # subtable
+color = "red"
+shape = "round"
+
+[[fruits.varieties]]  # nested array of tables
+name = "red delicious"
+
+[[fruits.varieties]]
+name = "granny smith"
+
+
+[[fruits]]
+name = "banana"
+
+[[fruits.varieties]]
+name = "plantain"