"Click" the current time in touch bar to show remaining time

[AllanLRH]

System and IINA version:

• macOS 10.13.2
• IINA 0.0.14.1

Expected behavior:
"Clicking"/touching the "current time" on the touch bar should show the remaining time — or something else, but something should happen ☺︎

Actual behavior:
Currently, nothing happens.
Changing between current playback time and time left seems quite common amongst media players, and I think it's a intuitive result of touching the current playback time.

[prohtex]

I'd like to see this too!

[uiryuu]

Since we already have a similar time label on our control bar, clicks it toggle between displaying remaining time and total time. I can either bind these two or make they record their states separately. What do you guys think? Also cc @lhc70000 @saagarjha