remove instruction 'remove_blocks' in favor of 'remove' property

[hummer2k]

Currently we can remove blocks via the instruction 'remove_blocks'

A nicer solution would be to remove blocks via a property or key inside the block definition itself:

return [
    'blocks' => [
        'some.block' => [
            'remove' => true
        ]
    ]
];

or xml

<layout>
    <blocks>
        <some.block remove="1" />
    </blocks>
</layout>