Allowing user to customly setup server charset when connecting to a Telnet host

ui/commands/common.js

@@ -17,6 +17,49 @@
 
 import Exception from "./exception.js";
 
+export const charsetPresets = [
+  "utf-8",
+  "ibm866",
+  "iso-8859-2",
+  "iso-8859-3",
+  "iso-8859-4",
+  "iso-8859-5",
+  "iso-8859-6",
+  "iso-8859-7",
+  "iso-8859-8",
+  "iso-8859-8i",
+  "iso-8859-10",
+  "iso-8859-13",
+  "iso-8859-14",
+  "iso-8859-15",
+  "iso-8859-16",
+  "koi8-r",
+  "koi8-u",
+  "macintosh",
+  "windows-874",
+  "windows-1250",
+  "windows-1251",
+  "windows-1252",
+  "windows-1253",
+  "windows-1254",
+  "windows-1255",
+  "windows-1256",
+  "windows-1257",
+  "windows-1258",
+  "x-mac-cyrillic",
+  "gbk",
+  "gb18030",
+  "hz-gb-2312",
+  "big5",
+  "euc-jp",
+  "iso-2022-jp",
+  "shift-jis",
+  "euc-kr",
+  "iso-2022-kr",
+  "utf-16be",
+  "utf-16le"
+];
+
 const numCharators = {
   "0": true,
   "1": true,