Add all of the Favicon meta tags to 8.x-1.x

I've created all the favicons plugins from 7.x.

All the favicons print the right tag on frontend except for mask-icon that need works to handle the color and the url.

Hi @DamienMcKenna,

Thanks, running test as you suggested i saw that also schema is missing i'm fixing that as well.
I guess that test needs to extend also testTagsInputOutput() method in MetatagTagsTestBase because on line 222 there is an assert that return error if more than one tag with the same name is found.

- add schema for all favicons.
- add $tags for all favincs tests and fixed few issues with naming.

Implements {meta_tag_name}_test_output_xpath()

Fixed metatag ids and tests.
Remove default shortcut icon tag if it is defined from metatag module.

@DamienMcKenna have you some suggestions in how to proceed to implements the mask-icon?

We need an extra field "color" in the same tag configurable from backend.

Hi all, this patch only remove a few blank spaces at the end of a few lines.

Thanks for the feature-request, it worked ok for me.

Hi Damien,

Thanks! I found just 2 typo in the code.

I'm not sure if was better open a new issue just for that.

Also the "use" statement is wrong in all the Icons that are using LinkSizesBase

That is great work, of course! But some meta missing additional attributes. Like color in mask-icon or type in icon.