Extract property base information

[dexX7]

The underlying idea is basically to end up with something like:

Object obj;
PropertyToJSON(..., obj);
PropertyGrantsToJSON(..., obj);
PropertyHistoryToJSON(..., obj);

Just made this up, but there are a few parts where information is reused as well as some inconsistencies here and there.

A maybe better example: think of a crowdsale, it's a composition of:

• "property info"
• "property ownership"
• "crowdsale specifics"
• "crowdsale participants"

... which could then be combined with some basis information about the transaction itself. This may include the fields txid, block, blocktime etc...

[zathras-crypto]

Looks like a nice cleanup, LGTM.