[fpc-pascal] OData and Office365 REST API support

[Marco van de Voort]

In our previous episode, Michael Van Canneyt said:

> PS. Maybe switching to git alone may make a checkout less painful, if we may
> believe some supporters... But that is the topic of a separate thread :-)

Wrong problem, better eliminate the need for repeated checkouts rather than
optimize them.  

The core thing to do would be to adopt a mechanism like configure where
build and source directories are strictly separated.  This would avoid 99%
of the problems of having to do a fresh checkout for automated builds, and
also be a great asset in crossbuilding.