Ability to track more than one URL

[sguerrini97]

This allows to track multiple URLs with a single scraper instance.
It is also possible to give a name to every search URL, if specified it will be printed on the console and sent in the Telegram message.

The GUI configuration part is ugly, but I don't have much experience with Tk.

Backwards compatible with older config (single URL).
The GUI will convert the old single URL format to the new multiple URLs format.

Example config.json

{
  "urls": [
    {
      "name": "console",
      "url": "https://www.ebay.it/sch/i.html?_from=R40&_nkw=console&_sacat=0&LH_ItemCondition=7000&_sop=10&rt=nc&LH_PrefLoc=3"
    },
    {
      "name": "nintendo_switch",
      "url": "https://www.ebay.it/sch/i.html?_from=R40&_nkw=nintendo+switch&_sacat=0&LH_ItemCondition=7000&_sop=10&rt=nc&LH_PrefLoc=3"
    },
    {
      "name": "ps4",
      "url": "https://www.ebay.it/sch/i.html?_from=R40&_nkw=ps4&_sacat=0&_sop=10&LH_ItemCondition=7000&rt=nc&LH_PrefLoc=3"
    },
    {
      "name": "ps5",
      "url": "https://www.ebay.it/sch/i.html?_from=R40&_nkw=ps5&_sacat=0&_sop=10&LH_ItemCondition=7000&rt=nc&LH_PrefLoc=3"
    }
  ],
  "telegramAPIKEY": "***",
  "telegramCHATID": "***",
  "databaseFile": "database.db",
  "sleep": "300"
}