[fpc-pascal] Add API to official documentation search

[Michael Van Canneyt]

On Sun, 17 Nov 2019, Ryan Joseph via fpc-pascal wrote:

> Could FPC make an API for the official documentation search at https://www.freepascal.org/docsearch/docsearch.var so we could make calls like:
>
> https://www.freepascal.org/docsearch/docsearch.var?word=List
>
> and get back a JSON object that had the search results? This is important for integration with 3rd party IDE's.

See my response to Graeme.

Even Microsoft asked official permission to use our website as pascal reference.

Michael.