Custom Block Building in 5.6.1.2
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Looking at the system blocks under /concrete/blocks I see that the controller.php files in each block have limited functionality. They extend a class and nothing else. Is this a sign that the current function of controller.php in custom blocks is being deprecated? I have managed to build a couple of custom blocks which make use of controller.php, so it's obvious it's still functional right now.
Core classes that could be overridden have been moved back to /core. So now you can override by extending a /concrete/core class, rather than completely replacing a /concrete class.