implement game configuration file

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

third-party/tomlc99/stdex/keys05.toml.res

@@ -0,0 +1,7 @@
+{
+  fruit = {
+    name = "banana",
+    color = "yellow",
+    flavor = "banana",
+  },
+}