add `options.save` to all changes

This is an idea. By passing options down in all of the change methods, like @doodlewind did in setValue() it would allow us to have any change not be saved by doing:

change.someMethod(...args, { save: false })

Which seems nicer than the current confusing setFlag('save', false)...setFlag('save', true) workflow surrounding changes. It would probably allow us to remove that weird code.

[ianstormtaylor]

To be clear, this would add { save: false } as an optional argument to all change methods, such that you can write:

change.addMarkByKey(node.key, 'bold', { save: false })

But if you do multiple changes, you’ll need to add { save: false } to each of them.

[ianstormtaylor]

@tobiasandersen that would be great!