Feature request: Updatable texta attribute entities

[mattrei]

Right now, the text attribute for instance cannot be updated in the gui-button component, by using A-Frames update function. I think at least the text attribute should be updatable, without removing the entity and creating a new one.

This applies to all components that have a text attribute.

[rdub80]

@mattrei we are currently looking into a more stable way to display TTF text in our components, the update function is also on the radar for that one. Thanks for making the suggestion!