implement game configuration file

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

third-party/tomlc99/stdex/tab01.toml.res

@@ -0,0 +1,10 @@
+{
+  table-1 = {
+    key1 = "some string",
+    key2 = 123,
+  },
+  table-2 = {
+    key1 = "another string",
+    key2 = 456,
+  },
+}