Internal Shortcodes: vimeo_simple + vimeo (default)

[onedrawingperday]

Based on the work of @bep see: 448081b
Related issue: #4749

Added the following:

• A simple variant for Vimeo
• Modified the Privacy Config to include simple mode for Vimeo
• Added again __h_simple_assets.html and changed the classes prefix to __h_video since this is meant to be used in both Vimeo and (hopefully) YouTube simple shortcodes.
• Added a SVG play button that I designed and release it under the Apache 2.0 Licence
• Also updated the standard Vimeo shortcode.
• Removed the frameborder attribute from the iframe because it is obsolete, added border: 0; and removed the 30px top-margin from the inline style.

N.B.
I was unable to have these changes reflected in a compiled binary. I think I'm missing something. I was able to run mage generate but still I didn't see anything new when I run go build.

I was only able to test these shortcodes locally when I included them in a Hugo project.

So this PR needs to be tested some more.

[onedrawingperday]

@bep I tried to fix the following Test error for the Vimeo shortcode but it's beyond me.

I will leave this as is for now.
You can take whatever you want from this PR whenever you want.

FAIL: TestShortcodeVimeo (0.03s)
	Error Trace:	testhelpers_test.go:491
			embedded_shortcodes_test.go:265
	Error:      	Should be true
	Test:       	TestShortcodeVimeo
	Messages:   	File no match for
	            	"(?s)\n<div style=\".*?\">.*?<iframe src=\"//player.vimeo.com/video/146022717\" style=\".*?\" webkitallowfullscreen mozallowfullscreen allowfullscreen>.*?</iframe>.*?</div>\n" in
	            	"public\\simple\\index.html":
	            	
	            	 <div style="position: relative; padding-bottom: 56.25%%; padding-top: 0px; height: 0; overflow: hidden;">
	            	   <iframe src="//player.vimeo.com/video/146022717" style="position: absolute; top: 0; left: 0; width: 100%%; height: 100%%; border:0;" title="Vimeo Video" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
	            	 </div>
FAIL
FAIL	github.com/gohugoio/hugo/hugolib	26.669s 

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