Convert type keywords inside array types (#132)

[paulirwin]

Fixes #132.

Problem

Type keyword conversions (String → string, Integer → int, etc.) were skipped whenever the type name was an array:

String[] lemmatize(String[] toks, String[] tags);

converted to String[] Lemmatize(String[] toks, String[] tags) instead of using string[].

Cause

TypeNameParser's grammar had no production for array brackets. After parsing the identifier, the [ token remained, so ParseTypeName hit its "extra tokens" fallback and returned the input verbatim — bypassing the conversion table entirely.

Fix

Added an ArraySuffix() rule and applied it after both the plain-identifier and generic branches of TypeName(), so brackets are consumed for String[], String[][], MyType<String>[], and List<String[]> alike. TypeName() was flattened to an early-return shape so both branches share the suffix handling.

Grammar is now:

TypeName     = identifier [ "<" TypeArgument { "," TypeArgument } ">" ] { "[" "]" }.
TypeArgument = [ "?" [ "extends" | "super" ] ] TypeName.

Tests

Written TDD — the new tests fail on master and pass with the fix. Added a theory covering the array shapes above plus a non-converted type (MyType[]), and an end-to-end test of the issue's exact method signature. Full suite: 273 passing.

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