Changed `--output-file` to `--output`
Default output file now has a timestamp in the name, no more overwriting
Added Section headers and file markers
Taken time is now measured and output
And some format changes were made
refs #3446
By calling `icinga2 troubleshoot collect [--console]` a small file
containing basic application information and a tail of all found logs
and the latest crash report will be created [or displayed].
It does not collect config files at the moment.
refs #3446