[Tool] Batch close old issues

[sledgehammer999]

@qbittorrent/bug-handlers @qbittorrent/frequent-contributors I have coded this tool in the past couple days.

It can close old issues, leave a comment, apply a label, lock the issue and skip issues with certain labels.

After I apply my other tool mentioned in #12101 I intend to run this tool on the repo with the following arguments:

 --cutoff-timepoint=2019-05-06T00:00:00Z --apply-label="autoCloseOldIssue" --skip-label="Feature request" --comment="This issue is automatically closed for being very old with no activity.\nIf you still experience it with the latest qBittorrent version then feel free to open a new issue." --lock

I chose 2019-05-06T00:00:00Z semi-randomly. It is the day after the v4.1.6 release which was about 1 year ago. I figured that all those issues can be closed instantly. PS: This will not close issues that were updated after that timepoint. eg by someone leaving a comment, applying a label etc.

A dry-run of the above cmdline shows that 819 will be closed.

Second Phase

After the above procedure, I plan the following for all issues between v4.1.6 and v4.2.0:

1. Non updated issues till today, will be marked with a label
2. A comment will be left, informing users for the imminent issue closing
3. After 10-15 days, the marked ones will be rechecked. If no activity was present they will be autoclosed and locked

Do you have any comments on the above before I proceed?

[xavier2k6]

@sledgehammer999 Do you plan to do another run of this batch tool in the near future?