Rename to lexer and split in files

parser.go

@@ -0,0 +1,22 @@
+package toml
+
+type parser interface {
+	Whitespace(b []byte)
+	Comment(b []byte)
+	UnquotedKey(b []byte)
+	LiteralString(b []byte)
+	BasicString(b []byte)
+	Dot(b []byte)
+	Boolean(b []byte)
+	Equal(b []byte)
+	ArrayBegin()
+	ArrayEnd()
+	ArraySeparator()
+	InlineTableBegin()
+	InlineTableEnd()
+	InlineTableSeparator()
+	StandardTableBegin()
+	StandardTableEnd()
+	ArrayTableBegin()
+	ArrayTableEnd()
+}