feat(FEC-8084): add loading spinner while preforming change media

[dan-ziv]

Description of the Changes

1. Build a reset preset which will allow us to change and extend the player UI when stopped - for now only the loading component appear there.
2. Fix logic in loading & pre playback components.
3. create util methods in component-config.js to allow components reducers to handle config actions.
4. Add listeners in loading reducer to config change actions.

TODOS:
Change all components which supports external config to handle it like the loading reducer.

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