patterns: Added Icon/Cursor image pattern

patterns/ico.hexpat

@@ -0,0 +1,45 @@
+#pragma endian little
+
+#pragma MIME image/vnd.microsoft.icon
+#pragma MIME image/x-icon
+#pragma MIME image/icon
+#pragma MIME image/ico
+#pragma MIME text/ico
+#pragma MIME application/ico
+
+enum ImageType : u16 {
+	Icon = 1,
+	Cursor = 2
+};
+
+struct ICONDIR {
+	u16 reserved [[hidden]];
+	ImageType type;
+	u16 num_images;
+};
+
+struct ImageData {
+	u8 data[parent.image_data_size] [[inline]];
+};
+
+struct ICONDIRENTRY {
+	u8 width, height;
+	u8 num_colors;
+	u8 reserved [[hidden]];
+	
+	if (header.type == ImageType::Icon) {
+		u16 color_planes;
+		u16 bits_per_pixel;
+	} else if (header.type == ImageType::Cursor) {
+		u16 horizontal_hotspot_coordinate;
+		u16 vertical_hotspot_coordinate;
+	}
+	
+	u32 image_data_size;
+	ImageData *image_data : u32;
+};
+
+ICONDIR header @ 0x00;
+ICONDIRENTRY images[header.num_images] @ $;
+
+std::assert(header.reserved == 0x00, "Invalid ICO header");