Replace 'parseCueTime' with 'parseTimeStamp'

[CharlieStras]

Hi, I found that there is no "parseCueTime" in Video.dev.js(4.12.9) which is the stable version now. So I changed the "parseTimeStamp" function of Video.js and replaced "videojs.TextTrack.prototype.parseCueTime" with it. Maybe this will be better :)

[CharlieStras]

In commit "410cc7d", I added 300ms delay for "keyup" events and reset the slider when control panels' value are both correct.

In the old one, something like this may happen:

Start is 0:0:2 and end is 0:0:5

Set start to 0:0:10

Set end to 0:0:20

Now the start's value and end's value are both correct, but the slider is still set as 0:0:1 to 0:0:20, and the left control panel's second border is still red.

So I reset them as the values change appropriately.