implement game configuration file

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

third-party/tomlc99/stdex/float1.toml.res

@@ -0,0 +1,9 @@
+{
+  flt1 = 1.000000,
+  flt2 = 3.141500,
+  flt3 = -0.010000,
+  flt4 = 49999999999999995805696.000000,
+  flt5 = 1000000.000000,
+  flt6 = -0.020000,
+  flt7 = 0.000000,
+}