Skip already installed components

[Tobbe]

Some components have dependencies on other components. Like the Carousel component for example depends on the Button component.

By default, if you already have the Button component, when trying to install the Carousel component it will fail saying "component already installed, run with --force to overwrite". And if you do run with --force it works.

It'd be much nicer if it could parse the list of required component and check which ones are already installed and just skip trying to install those again