Support findProperty everywhere hasProperty is supported

[Vampire]

Currently only Project has a findProperty method with which you can use elvis-operator syntax like
project.findPropery('foo') ?: 'default'
instead of the cumbersome
project.hasPropery('foo') && foo ? foo : 'default'

It would be nice if all places that have hasProperty would also support findProperty.

[stale]

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