[Lazarus] Extending FCL documentation

[Hans-Peter Diettrich]

Michael Schnell schrieb:

> Yep. Providing a dedicated "external help viewer" interface should be 
> fool proof, does not need recompilation (even though I don't esteem this 
> very important), and allows for multiple help online and offline viewers 
> be separately managed and distributed projects (also possible with 
> packages).

How shall these viewers share content?

DoDi