Adding "make a recording" option in the audio widget

This issue is about adding a possibility to record audio in the audio widget.
This also requires some additional changes in an audio widget.

1. Instead of having all available options instantly make a tab with three choices:

• Choice 1 (selected by default): Upload Audio File

• Choice 2: Link Audio Source

• Choice 3: Record Audio

• Use the same UI as we use in summary for changing between textual/default editor.

• Change the tab title to 1em and padding to 0.833em ( this affects all the editors that are using these tabs )

2. Upload file:

• Design:

• Have only cancel button. Upload starts when you select audio file, no need for an upload button ( keep the same behavior as we have now )

3. Link source:

• Design:

• Same behavior as we have now

4. Record audio:

• Design:

• Implement audio recorder here.

• Starting screen:

• Recording in progress:

• Recording paused:

• Recording done:

• Audio recorder looks and should work the same way as audio recorder we implemented here. https://h5p.org/node/83471 but should be done as a part of the editor widget.

• Difference in behavior is that we don't have "download" button when recording is done but instead, we get "insert" button when recording has been made.

• Pressing cancel at any time would cancel the recording ( with a popup -
  title: Cancel recording?
  content: By pressing "Cancel" you will loose your current recording.)