chat: attachment preview: - if there is not already one, a preview is generated for images collection thumbnails, instead of using the full size image. - for images attachment, local path is now used if present, before URL.

[DEFAULT]
bridge = pb
log_level = debug
log_fmt = #[%%(levelname)s][%%(name)s] %%(message)s

[cagou]
no_certificate_validation = true
log_level = debug
log_fmt = [%%(levelname)s][%%(name)s] %%(message)s