prompt description

prompts/9-weighted-random-selector

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+in wfc.hpp there are 2 random selector structs. I want you to create another one that can be used to give weights to values.
+use 16-bit for the individual weights for each value. The weights should work at compile time.
+The WeightedSelector is a RandomSelector that uses another random selector as a backend.
+example of how the weights should work:
+Builder::
+    ::DefineIDs<...>
+    ::DefinedConstrainer<...>
+    ::SetRandomSelector<...>
+    ::Weights<DEFAULT_WEIGHT, Weight<VarT, WEIGHT>, Weight<VarT, WEIGHT>, ...>
+    ::Build