Draft: Core config + Icons set POC + SDC

Closes #3432173

I'm not sure about adding another external dependency... Plus there could easily be people adding their own custom svg/png like a specific internal logo.

from template class="ph ph-{{ navigation_icon }} toolbar-button__icon">

• add setting to form with (main) navigation settings the library prefix. this is general responsibility of the admin to use a prefix that is available (until there is a greater Icons solution in core).

options: navigation_type: 'library'. // library|file navigation_icon: 'megaphone' navigation_fid: 0, //. zero would stand for no file attached. - add file selection to NavigationBlock (settings tray) level selection for currently selected 1st level items.

I've added simplest use case. Library should be attached. And well documented outside. It can be scaled to custom libs later.

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• 15205b83...01da0fd9 - 122 commits from branch project:11.x
• f4e27006 - Core config + Icons set POC

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• 1ac3e625 - Core config + Icons set POC + SDC

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changed title from Draft: Core config + Icons set POC to Draft: Core config + Icons set POC + SDC

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• 09e03c78 - material symobl label trans filter added

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• bed83f7d - 3432173: Fix the PHPCS issue occuring on the files.

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