Ini file read and write

Usage

host=google.com
port = 8080 ; this is comment

[account]
; this is another\
comment
type= "admin"
user= entao \
yang

[group]
dept=dev
desc= this is desc\;\n newline

  IniFile ini = IniFile.parse(s);
  println(ini);
  println();
  ini.put("dept", "test", section: "group");
  String out = ini.toString();
  println(out);

  test("Ini file test", () {
    expect(ini.get("host"), "google.com");
    expect(ini.get("port"), "8080");
    expect(ini.get("user", section: "account"), "entao \nyang");
    expect(ini.get("type", section: "account"), "admin");
    expect(ini.get("dept", section: "group"), "test");
    expect(ini.get("desc", section: "group"), "this is desc;\n newline");
  });