Update transcriber VTT function

[MatthiasReumann]

Description

• Remove custom VTT formatting function
• Use whisper's WriteVTT
• Add max_line_length option in order to fulfill Netflix' recommendation of subtitle length

Example:

New:

WEBVTT

02:42.500 --> 02:50.320
Good. So the gentleman in front reminded
me that I forgot to upload this slide. So

02:50.320 --> 02:56.040
it's there. It's there. I did it live. You
saw me doing it. Okay. Welcome to another

Old:

WEBVTT

1
00:02:30.000 --> 00:02:51.000
Good. So the gentleman in front reminded me that I forgot to upload this slide. So it's there.

2
00:02:51.000 --> 00:02:57.000
It's there. I did it live. You saw me doing it. Okay. Welcome to another edition of

As you can see milliseconds are now also included.