Add Unicode dash, add contractions, make an' unambiguous

lib/src/main/java/com/keenwrite/quotes/Contractions.java

lib/src/main/java/com/keenwrite/quotes/Lexer.java

		lexeme = createLexeme( QUOTE_DOUBLE, began, i.getIndex() );
		}
		- else if( curr == '-' && peek( i ) == '-' ) {
		- slurp( i, ( next, ci ) -> next == '-' );
		+ else if( curr == '-' && peek( i ) == '-' \|\| curr == '—' ) {
		+ slurp( i, ( next, ci ) -> next == '-' \|\| next == '—' );

		lexeme = createLexeme( DASH, began, i.getIndex() );

lib/src/test/java/com/keenwrite/quotes/KeenQuotesTest.java

		public void test_parse_SingleLine_Parsed() {
		out.println( KeenQuotes.convert(
		- "shouldn't drop letters, nor say \"ain't\" or \"hain't.\"",
		+ "\"’Kearney lives on the banks of Killarney—’",
		out::println
		) );


		@ParameterizedTest
		- @ValueSource( strings = {"chapman", "habberton", "foote"} )
		+ @ValueSource( strings = {"westrup"} )
		void test_Parse_Story_Converted( final String filename ) throws IOException {
		final var sb = new StringBuilder( 2 ^ 20 );
		+ System.out.println( "---------------------" );
		+ System.out.println( filename );

		try( final var reader = open( filename + ".txt" ) ) {
		String line;

		while( (line = reader.readLine()) != null ) {
		sb.append( line ).append( '\n' );
		}
		}

		- KeenQuotes.convert( sb.toString(), out::println );
		+ System.out.println( KeenQuotes.convert( sb.toString(), out::println ) );
		}

lib/src/test/resources/com/keenwrite/quotes/smartypants.txt

		shouldn't drop letters, nor say “ain't” or “hain't.”

		+#"’Kearney lives on the banks of Killarney—’
		+#“’Kearney lives on the banks of Killarney—’
		+
		# ########################################################################
		# Mixed

Delta	14 lines added, 5 lines removed, 9-line increase