Using the custom element manifests to generate this library

[sherpal]

With version 1.9.0 of SAP UI5's library, they furnish a programmatic way to get access to the public API of the components.

This should be enough to create an engine capable of generating a huge part of this library by itself.

See here and there. Example for Avatar here.

We should do that, as it will greatly improve standardisation of the "codebase", and reduce maintenance burden.