implement game configuration file

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

third-party/tomlc99/stdex/arrtab7.toml.res

@@ -0,0 +1,19 @@
+{
+  points = [
+    {
+      x = 1,
+      y = 2,
+      z = 3,
+    },
+    {
+      x = 7,
+      y = 8,
+      z = 9,
+    },
+    {
+      x = 2,
+      y = 4,
+      z = 8,
+    },
+  ],
+}