Add open transcription (open file)
Add ad-hoc syntax for highlight transcription texts

At the moment, it only highlights audio marks and participants as
the follow examples:
* Audio mark: #0:04:43.5#
  To indicates the audio position at 0 hours, 4 minutes, 44 seconds
  and 500 miliseconds
* Participants: T:
  Or any text at the beginning of a line with colon afterwards.
Set a more sensible steps for page backwad/forward

In practice, 10 seconds was a lot. 4 seconds seems more
sensible.
Set space between paragraphs

To avoid pressing extra carriage return to distinguish between
paragraphs.
Fix comment style
Insert audio mark on F8 or Return

Automatically add an audio mark when pressing Enter/Return.
That makes every paragraph searchable.
Change format of audio mark and split methods to set it out

* Use hours, minutes, seconds and miliseconds as #h:mm:ss:m#.
* Split the function to make reusable and receive the audio as
  float ans string simultaneously.
Update audio position by selecting audio marks in text
Add audio marks when loading trasncription from file
Improve comments and make parameter names meaningful