v2.4.0 multiple updates makes arttime work seamlessly on more systems

When setting a timer for an absolute time like 7:00PM, use the current time zone set by user instead of default time zone. So now if a user has a meeting in different timezone, they can change to that timezone, set a timer like 7:00PM and get back to their original timezone to see what that means in their timezone.
Updated recommended pipe usage and pipe handling. The most portably correct way is to surround pipes involving arttime in parentheses. If the user doesn't do that and their shell doesn't like pipes to handoff for interactive use, arttime exits gracefully asking users to rerun their pipe involving arttime in (). Examples of pipe usage are at arttime wiki.
Added fallback for terms that don't support auto margins.
Disabled warning that is not relevant anymore as we restrict art pairs in flip-flop animation to have same height.
Update fzf invocation to be more portable and remove deprecated usage that doesn't work on newer distributions.
Added Containerfile to build docker, etc images. At the moment prebuilt arttime images are available for amd64, aarm64, and riscv64, others can try alternative command listed at docker hub.
Added some more ascii art.

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