EZP-21315: added embed tags to schemas
EZP-21315: added template block for RichText fields
EZP-21315: implemented conversion of embed tags
EZP-21315: added RichText EmbedRenderer interface
EZP-21315: implemented Symfony RichText EmbedRenderer
EZP-21315: implemented embedding converter
EZP-21315: tested embed payload conversion
EZP-21315: fixed additional test fixtures mapping
EZP-21315: configure renderer and embed converter
EZP-21387: implemented embed views
EZP-21315: map parameters for legacy fallback rendering
EZP-21315: fixed CS
EZP-21315: fixed: make logger optional
EZP-21315: fixed: move tag-view map out of the loop
EZP-21315: fixed: expose rendering strategy to configuration
EZP-21315: removed todo
EZP-21315: fixed: use SecurityContext to check access
EZP-21315: fixed docblock return annotation
Merge pull request #758 from ezsystems/implement-EZP-21315-richtext-embed

Implement EZP-21315: Implement embed tag for RichText