Dropzone should support required attribute

[endigo9740]

Current Behavior

Let's make use of $$restProps to allow for required and any other arbitrary input attributes. The Slide Toggle provides a good reference for how to set this up. Note how we prune $$restProps.class to ensure arbitrary classes are still handled on the parent. We don't want those getting copied to the hidden input as well.

Steps To Reproduce

n/a

Anything else?

Reported by user fnf on Discord in the support channel.

[endigo9740]

Note: let's verify the File Button component follows the same pattern.

[endigo9740]

@leranjun I've managed to update this and the File Button components to use $$restProps which means they will pass any valid input attribute directly to the hidden input embedded within the component. I've also update the documentation for both these, the range slider, and slide toggle to indicate the use of $restProps as well.

Thanks for the heads up on this! Expect this update to roll out with the new release coming tomorrow!

[rakuzen25]

Thanks a lot! Looking forward to it!