Respect COMMENT keyword in headers

[hpgisler]

Is your feature request related to a problem? Please describe.
In my rather large org files I track various projects and specifically I do meeting minutes in them. This means, that I will copy from week to week an entire section with all its (todo) subsections to be updated.
Without special handling of the 'old' minutes, this would lead to a mess. However in Emacs applying the keyword COMMENT to old sections will make them invisible for the agenda and thir outdated todos won't show up anymore.

Organice does not respect the COMMENT keyword and thus all past, outdated tasks show up in the agenda.

Describe the solution you'd like
Respect the COMMENT keyword.

Describe alternatives you've considered
Perhaps archiving of old headers would be a better solution. However I like to have the whole history inside one file.

[schoettl]

Good point.

There is also org-toggle-archive-tag which adds an :ARCHIVE: tag which in org mode would also exclude the header from the agenda. Here, the header would stay in the same file.

But probably both COMMENT and :ARCHIVE: are not respected by organice' agenda.

Would you like to provide a pull request for that?