[FR] option to override "savename"

[Kariton]

it would be helpful to override the "savename" in script-output.

i use bash to fetch the last changed save game and run mapshot cli on it. this results in a bunch of autosaveX named mapshots.

# /mapshot/factorio/script-output/mapshot# ls -la
drwxr-xr-x. 7 root root  7 Nov 30 18:07 .
drwxr-xr-x. 3 root root  3 Nov 30 08:33 ..
drwxr-xr-x. 6 root root 11 Dec  1 02:12 _autosave1
drwxr-xr-x. 4 root root  9 Dec  1 00:49 _autosave2
drwxr-xr-x. 6 root root 11 Dec  1 02:38 _autosave3
drwxr-xr-x. 4 root root  9 Nov 30 19:12 _autosave4
drwxr-xr-x. 6 root root 11 Dec  1 02:56 _autosave5

i would love to see a parameter to override this and define a common folder for all mapshots.