Define and use Unicode code points 0x2015 through 0x2021 in unicode_to_cp437()

for some obvious (but missing) mappings.

src/xpdev/unicode.c

@@ -484,6 +484,20 @@ char unicode_to_cp437(enum unicode_codepoint codepoint)
 		case UNICODE_SET_MINUS:									return '\\';
 		case UNICODE_ASTERISK_OPERATOR:							return '*';
 
+		case UNICODE_DOUBLE_VERTICAL_LINE:						return CP437_BOX_DRAWINGS_DOUBLE_VERTICAL;
+
+		case UNICODE_DOUBLE_LOW_LINE:							return '=';
+		case UNICODE_LEFT_SINGLE_QUOTATION_MARK:
+		case UNICODE_RIGHT_SINGLE_QUOTATION_MARK:
+		case UNICODE_SINGLE_HIGH_REVERSED_9_QUOTATION_MARK:		return '\'';
+		case UNICODE_SINGLE_LOW_9_QUOTATION_MARK:				return ',';
+		case UNICODE_LEFT_DOUBLE_QUOTATION_MARK:
+		case UNICODE_RIGHT_DOUBLE_QUOTATION_MARK:				
+		case UNICODE_DOUBLE_LOW_9_QUOTATION_MARK:
+		case UNICODE_DOUBLE_HIGH_REVERSED_9_QUOTATION_MARK:		return '"';
+		case UNICODE_DAGGER:									return CP437_BOX_DRAWINGS_VERTICAL_AND_HORIZONTAL;
+
+		case UNICODE_HORIZONTAL_BAR:
 		case UNICODE_OVERLINE:
 		case 0x2500: // Box Drawings Light Horizontal
 		case 0x2501: // Box Drawings Heavy Horizontal

src/xpdev/unicode_defs.h

@@ -251,6 +251,19 @@ enum unicode_codepoint {
 	UNICODE_ZERO_WIDTH_NON_JOINER = 0x200C,
 	UNICODE_ZERO_WIDTH_JOINER = 0x200D,
 	UNICODE_EM_DASH = 0x2014,
+	UNICODE_HORIZONTAL_BAR = 0x2015,
+	UNICODE_DOUBLE_VERTICAL_LINE = 0x2016,
+	UNICODE_DOUBLE_LOW_LINE = 0x2017,
+	UNICODE_LEFT_SINGLE_QUOTATION_MARK = 0x2018,
+	UNICODE_RIGHT_SINGLE_QUOTATION_MARK = 0x2019,
+	UNICODE_SINGLE_LOW_9_QUOTATION_MARK = 0x201A,
+	UNICODE_SINGLE_HIGH_REVERSED_9_QUOTATION_MARK = 0x201B,
+	UNICODE_LEFT_DOUBLE_QUOTATION_MARK = 0x201C,
+	UNICODE_RIGHT_DOUBLE_QUOTATION_MARK = 0x201D,
+	UNICODE_DOUBLE_LOW_9_QUOTATION_MARK = 0x201E,
+	UNICODE_DOUBLE_HIGH_REVERSED_9_QUOTATION_MARK = 0x201F,
+	UNICODE_DAGGER = 0x2020,
+	UNICODE_DOUBLE_DAGGER = 0x2021,
 	UNICODE_BULLET = 0x2022,
 	UNICODE_HORIZONTAL_ELLIPSIS = 0x2026,
 	UNICODE_LINE_SEPARATOR = 0x2028,