Documentation/generated typescript updates - Object, Bangle and optionals

[bobrippling]

This updates a few methods on Bangle, Object and Graphics, along with changing documented optional properties/arguments to match the "[optional]" format used in build_types.js

[bobrippling]

I'm happy to also update the definitions in BangleApps if this is merged

[gfwilliams]

Looks great - thanks! And yes, if you could do a PR for the Typescript for Bangle.js that'd be great!