Fullscreen, remote control and overview navigation

[giflw]

Add impress.js updated blackout and fullscreen plugins

This update add support for remote control presentation buttons:

• blackout: using '.' key detection
• fullscreen: enter with F5 and exit with ESC

Next and previous slides using PageUp/PageDown are already supported

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This PR is being splitted into:

• fullscreen
• autoplay.js
• blackout.js
• help.js
• navigation.js

[giflw]

Add autoplay pause on blackout and resume when removeBlackout

Add events to pause/resume autoplay

• impress:autoplay:pause
• impress:autoplay:resume
  Call those events from blackout

[giflw]

On firefox, after blackout, slides where partially rendered.

[henrikingo]

Thanks @giflw for this new year's present! I have some minor comments and questions only.

[henrikingo]

Hi

Thanks for more work. The full help looks great, except does not conform to style / user experience. I will help you get it right.

But at this point it would be better to split this work into multiple small PRs. This is necessary to maintain a clean commit history where one thing is one commit. (You had done that originally, but then the fixes spoil it.) Also, some of your work is ready to be merged while other parts need changes still. This way we can merge the good parts already.

Could you create separate branch+PR for each:

• fullscreen.js (this is ready to go I think)
• autoplay.js (likewise)
• blackout.js (please remove the impress:help:add for now)
• help.js (Functionally you're doing the right thing, but this will need several changes.)
• navigation.js (Needs to be done differently, we can discuss in new PR.)

Sorry for the extra work, but on the positive side, this will get most of your code merged asap rather than always doing a little bit more.

[giflw]

No problem. I'll do that as soon as I can.

[giflw]

@henrikingo Added PR #712 for fullscreen

[giflw]

@henrikingo Added PR #713 for pause/resume events on autoplay

[giflw]

@henrikingo Changes on blackout needs autoplay to be merged, as it is used to pause/resume autoplay when enter/exit blackout

[giflw]

@henrikingo Added PR #714 for full help screen on help plugin

[giflw]

@henrikingo Added PR #716 for blackout support for . key

[giflw]

@henrikingo Added PR #717 for navigation (o toogle overview)