Make --info more script-friendly

[vodkolav]

What is the issue?

When a user requests transmission for info about a torrent:
michael@michael-pc:~$ transmission-remote -ne -t 179 -i
He's getting an almost YAML-like output:

NAME
  Id: 179
  Name: ubuntu-22.04.1-desktop-amd64.iso
  Hash: 3b245504cf5f11bbdbe1201cea6a6bf45aee1bc0
  Magnet: magnet:?xt=urn:btih:3b245504cf5f11bbdbe1201cea6a6bf45aee1bc0&dn=ubuntu-22.04.1-desktop-amd64.iso&tr=https%3A%2F%2Ftorrent.ubuntu.com%2Fannounce&tr=https%3A%2F%2Fipv6.torrent.ubuntu.com%2Fannounce
  Labels: 

TRANSFER
  State: Idle
  Location: /media/michael/Data/Downloads/Torrents
  Percent Done: 0.0%
  ETA: 0 seconds (0 seconds)
  Download Speed: 0 kB/s
...

apart from the categories (NAME,TRANSFER,...) , which don't have a trailing colon after them.
In such state the output is not parseable.

If the output were to have a colon after categories, e.g:

NAME:
  Id: 179
  Name: ubuntu-22.04.1-desktop-amd64.iso
  Hash: 3b245504cf5f11bbdbe1201cea6a6bf45aee1bc0
  Magnet: magnet:?xt=urn:btih:3b245504cf5f11bbdbe1201cea6a6bf45aee1bc0&dn=ubuntu-22.04.1-desktop-amd64.iso&tr=https%3A%2F%2Ftorrent.ubuntu.com%2Fannounce&tr=https%3A%2F%2Fipv6.torrent.ubuntu.com%2Fannounce
  Labels: 

TRANSFER:
  State: Idle
  Location: /media/michael/Data/Downloads/Torrents
  Percent Done: 0.0%
  ETA: 0 seconds (0 seconds)
  Download Speed: 0 kB/s
...

It would allow the user to parse the --info output as regular YAML using any cli tool and use it further in scripts, e.g:

michael@michael-pc:~$ transmission-remote  -ne -t 179 -i | yq  .TRANSFER.Location
/media/michael/Data/Downloads/Torrents

or

michael@michael-pc:~$ transmission-remote  -ne -t 179 -i |yq e '.ORIGINS.["Public torrent"]'
Yes

Which application of Transmission?

transmission-remote

Which version of Transmission?

3.00 (bb6b5a0)

[ckerr]

Duplicate of #2299, see #3819 for what was added in 4.0.0 😸