implement game configuration file

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

third-party/tomlc99/stdex/keys08.toml.res

@@ -0,0 +1,8 @@
+{
+  fruit = {
+    orange = 2,
+    apple = {
+      smooth = true,
+    },
+  },
+}