implement game configuration file

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

third-party/tomlc99/stdex/tab09.toml

@@ -0,0 +1,7 @@
+fruit.apple.color = "red"
+# Defines a table named fruit
+# Defines a table named fruit.apple
+
+fruit.apple.taste.sweet = true
+# Defines a table named fruit.apple.taste
+# fruit and fruit.apple were already created