Issue #3413703 by pdureau: Source plugins: methods naming and interfaces use

Issue #3311480 by pdureau, Grimreaper, DuaelFr: Reduce preprocess hooks usage by adding add_class() & set_attributes() filters

Closes #3413703

changed target branch from 8.x-1.x to 2.0.x

added 7 commits

• c1a1cee5 - 1 commit from branch project:2.0.x
• 1295a473 - Implements ContextAwarePluginManagerInterface & ContextAwarePluginManagerTrait
• d6b1e49e - Move methods to replace in a trait
• b2134811 - Add new methods and use them in the old methods
• 31db636a - Tidy up ComponentElementBuilder
• deba2917 - Add getPropTypeDefault()
• 67588ed1 - Use new methods in ComponentElementBuilder

Compare with previous version

merged