feat: keyboard shortcuts ui gestures

[dan-ziv]

Description of the Changes

Added keyboard shortcuts gestures to UI.

• Refactor the overlay-play component and rename it to overlay-action which can display overlay action gesture of any kind of icon.
• Added store for the overlay-action component. Using this store the keyboard component (or any other component) can call updateOverlayActionIcon(...) and supply an icon/s. The overlay-action component will know to display the correct icon based on the updated iconType prop.
• Fix the overlay animation to look like in Hillel's demo.

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

[dan-ziv]

@OrenMe please review
10x