implement game configuration file

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

third-party/tomlc99/stdex/keys10.toml.res

@@ -0,0 +1,12 @@
+{
+  apple = {
+    type = "fruit",
+    skin = "thin",
+    color = "red",
+  },
+  orange = {
+    type = "fruit",
+    skin = "thick",
+    color = "orange",
+  },
+}