Modernization: Convert to new implicit standard for classes

[mrmundt]

Fixes NA

Summary/Motivation:

In Python3, you no longer need to explicitly inherit from object for classes; it's now implicit that if you type:

class MyClass:

it is equivalent to class MyClass(object):

We like staying modern, so this PR removes all instances.

Changes proposed in this PR:

• Remove all instances of (object)

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