More liberal matching in REPL autocompletion

For the SHIFT-impaired: you can just write everything in lowercase,
(whisper-case?) and we'll try to DWYM.

We treat capital letters that you *do* enter as significant, they
can't match a lower case letter in an identifier.

Modelled after IntellIJ's completion.

I still don't fall into this mode if you enter an exact prefix of
a candidate, but we might consider changing that.

```
scala> classOf[String].typ<TAB>
   getAnnotationsByType   getComponentType   getDeclaredAnnotationsByType   getTypeName   getTypeParameters

scala> classOf[String].typN<TAB>
scala> classOf[String].getTypeName
res3: String = java.lang.String

scala> def foo(s: str<TAB>
scala> def foo(s: String
String   StringBuffer   StringBuilder   StringCanBuildFrom   StringContext   StringFormat   StringIndexOutOfBoundsException

scala> def foo(s: string<TAB>
scala> def foo(s: String
String   StringBuffer   StringBuilder   StringCanBuildFrom   StringContext   StringFormat   StringIndexOutOfBoundsException
```

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