BaseButton: removing autobind usage

[dzearing]

Attempting to remove autobind usage in BaseButton to understand:

1. does it affect bundle size at all
2. can we just use this simple pattern and get rid of having to import autobind and have code to do this.

Also, in general, I believe we may want to get away from decorators, so I'm looking at what that might look like here.

[dzearing]

@christiango @cschleiden @antonlabunets I think we will want to do this in bulk and get rid of autobind usage. it is easier, smaller, requires no import, and has no probability of failing because of a bad tslib __decorate update.

You can see that just updating this one file removed almost 100 bytes off the gzip size.

[Markionium]

I like this! :D Can help to do the same thing in other components if thats helpful.

[dzearing]

@Markionium yes please! That would be massively helpful.

[cschleiden]

@dzearing I'm still a fan of autobind ;) But sure, I'm fine with the changes.