Support a more complete (and simple) requirements gathering mechanism,

and add support for binary operations.

This version of requirements generation simply generates every numeric
size within a provided range, and then will reject trait implementations
that rely on values outside this range. It should be a little more easy
to reason about, and easier to make local changes as I (inevitably) need
to modify rules.

generation/generation.cabal

@@ -18,7 +18,7 @@ extra-source-files:  CHANGELOG.md
 
 executable generation
   main-is:             Main.hs
-  other-modules:       Gen, Requirements, UnsignedBase
+  other-modules:       BinaryOps, File, Gen, UnsignedBase
   -- other-extensions:
   build-depends:       base ^>=4.12.0.0,
                        containers,
@@ -27,3 +27,4 @@ executable generation
                        mtl
   hs-source-dirs:      src
   default-language:    Haskell2010
+  ghc-options:         -Wall