REPL namespaces; lib function for pattern matching

Adds support for REPL namespacing, primarily to avoid `main` collisions.
Also adds a library function for an ergonomic pattern matching function
that I've been noodling on. I might explore ways to make list syntax
less annoying specifically for pattern matching like this.

src/Research.hs

@@ -53,7 +53,7 @@ data EvaluatedForm = TreeCalculus | FSL | AST | Ternary | Ascii | Decode
   deriving (Show, Data, Typeable)
 
 -- Environment containing previously evaluated TC terms
-type Env = Map.Map String T 
+type Env = Map.Map String T
 
 -- Tree Calculus Reduction
 apply :: T -> T -> T
@@ -122,7 +122,7 @@ formatResult Ascii        = toAscii
 formatResult Decode       = decodeResult
 
 toSimpleT :: String -> String
-toSimpleT s = T.unpack 
+toSimpleT s = T.unpack
   $ replace "Fork" "t"
   $ replace "Stem" "t"
   $ replace "Leaf" "t"