implement game configuration file

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

third-party/tomlc99/stdex/float6.toml.res

@@ -0,0 +1,8 @@
+{
+  sf1 = inf,
+  sf2 = inf,
+  sf3 = -inf,
+  sf4 = nan,
+  sf5 = nan,
+  sf6 = nan,
+}