Add time display to viewer controls

[mmattel]

Based on the work of @tomschulze on original PR #223 and #224 (both closed).
Fixes #150 (suggestion from @hodyroff)
Tested on my dev environment and works as described

This adds the time to the video controls, pls see screenshot:

Original comment from @tomschulze:

A few remarks:

• I wasn't sure about your styling and I didnt wanna mess with your styles, so I used the viewer__control__count css class to style the display for test purposes (which disappears on small screens)
• totalDisplayTime is computed because it doesn't change during the video
• I put getDisplayTime() in helper.js since it seemed more like a utility function to me
• the function showTimeInfo() aggregates the displayed string

[phil-davis]

The code looks believable, but I am not the one to review JS.

[mmattel]

@DeepDiver1975 fixed all your comments 😃

[DeepDiver1975]

TypeError: moment.duration(...).format is not a function
    at s.getDisplayTime (eval at globalEval (jquery.js:328), <anonymous>:13:215107)
    at s.totalDisplayTime (eval at globalEval (jquery.js:328), <anonymous>:13:53036)
    at mi.get (eval at globalEval (jquery.js:328), <anonymous>:7:26688)
    at mi.evaluate (eval at globalEval (jquery.js:328), <anonymous>:7:27838)
    at s.eval [as totalDisplayTime] (eval at globalEval (jquery.js:328), <anonymous>:7:29697)

[mmattel]

@DeepDiver1975 you are challenging me 😄
please take a look on the update, thanks

[DeepDiver1975]

24 / 30 - nobody will understand this ....

[mmattel]

Hello @DeepDiver1975
First of all, thanks for reviewing and your patience.
When the video plays, you see the left part of the number block counting, while the right part shows the total time. Depending on the length, you see ss / ss or mm:ss / mm:ss or hh:mm:ss / hh:mm:ss. What is your suggestion of presentation?

[DeepDiver1975]

What is your suggestion of presentation?

At least 00:24 / 00:30 I'd say.

[mmattel]

OK, will try to have fixed minutes and optional hours as suggested

[mmattel]

Hello @DeepDiver1975 implemented your suggestion

[mmattel]

@DeepDiver1975 may I ask for a review - would like to get this finalized 😃

[mmattel]

Just seen that recently upgraded easytext from another PR we had a conflict in packages.json to be solved - done.

@deepdiver please review so we can merge it - many thanks 😊