feat: unmute indication for autoplay with volume failed

[dvh91]

Description of the Changes

Adding unmute indication in case player tried to autoplay with volume and failed.

CheckLists

• changes have been done against master branch, and PR does not conflict
• new unit / functional tests have been added (whenever applicable)
• test are passing in local environment
• Travis tests are passing (or test results are not worse than on master branch :))
• Docs have been updated

[OrenMe]

With ads the mute indication doesn't appear - need to handle and also make sure the new indication doesn't interfere with the top bar.
And also, seem like there's a regression as an exception is thrown when trying to use volume bar.

[OrenMe]

@dan-ziv @dvh91 please sync as this is causing the following behviour - when starting muted autoplay on Safari and clicking on the icon the ad pauses and the click handler goes crazy sometimes.