BaseProperty: clear resMan_ when moving from this class to preserve invariant depended on in PropertyPtr destructor.

Add "hidden" property to status.

See merge request !74

Remove useless default params from property classes

See merge request !73

Use relative include path, fixes #15

Closes #15

See merge request !72

use internal_type_name in property_exists() instead of dynamic_cast

Closes #13

See merge request !71

Fix operator-- in some of the new iterators

See merge request !69

Found in compiler warning:

```
../Type-OpenVolumeMesh/libs/OpenVolumeMesh/src/OpenVolumeMesh/Core/Iterators.cc:1558:18: warning: equality comparison result unused [-Wunused-comparison]
        hf_iter_ == halffaces.end();
```