Include notification of available update for command line users

[nilshoffmann]

While Skyline users will receive a visual cue that an updated version of LipidCreator is available from the ToolStore, users of the standalone version will not receive any notification at the moment.
It would be great if we could either check GitHub's releases API

Using a GET request with the HTTP Header Accept=application/json, the endpoint https://github.com/lifs-tools/lipidcreator/releases/latest returns

{
  "id": 48720087,
  "tag_name": "787",
  "update_url": "/lifs-tools/lipidcreator/releases/tag/787",
  "update_authenticity_token": "JLhrOeswHJxqD5oNBOh5bdu7UsoLtb7Z35M3Rdi5QFozpBeToO0UdC2PDeYHEYPTV59Onp8TEJvJNo3gzOqI4Q==",
  "delete_url": "/lifs-tools/lipidcreator/releases/tag/787",
  "delete_authenticity_token": "l6icnoZAaE83n8Km2Ka71vJPT2veQjT+KxbMSfoi5GU9qlmN5zgj/KOUWNBHt6aSNq78Dcl/OVBPwPSqhkn0KQ==",
  "edit_url": "/lifs-tools/lipidcreator/releases/edit/787"
}

Since our build numbers are strictly increasing, this can be checked against LipidCreator's internal build number. If the latest release number is greater, an update is available.

[nilshoffmann]

The actual call should go to

https://api.github.com/repos/lifs-tools/lipidcreator/releases/latest

See https://docs.github.com/en/rest/reference/repos#get-the-latest-release