Improve welcome message cooldown criteria

[CarrotManMatt]

Currently a welcome message will not be sent after induction if there has been a previous welcome message sent within the past 7 messages of the channel. This prevents frequent spam of welcome messages.

I suggest that the cooldown condition also includes a time based criteria. That is that the welcome message should be allowed to be sent if the previous condition was not met, but it has been greater than a certain amount of cooldown time. So a new welcome message can be sent right after a previous welcome message, so long as enough time has passed since the first welcome message was sent.

Thoughts on whether to include this change would be appreciated.

[CarrotManMatt]

A new idea I just came up with is to have a confirmation button. If the committee member chooses to induction not silently, and a message had already been sent recently they should be asked whether they wish to still send the welcome message or to switch to a silent induction to prevent clogging up the channel. This allows for overriding the cooldown or preventing mistakes if the committee member initially chose the wrong induction type.

[CarrotManMatt]

The initially implemented cooldown criteria were removed in #313

[MattyTheHacker]

yeah all this sounds good:

• lower recent message count
• add time based check
• allow cmt to override