- require public constructor for components
- removed XyzFactory classes
- enabled warning for XyzFactory headers
- some clean up and modernization

- and some minor format tweaking

- remove destructors qualified with 'override = default'
- prefer inheriting constructors

... plus some formatting tweaks,

Adding changes that make it possible to build Gaudi without AIDA and CppUnit. With a reduced set of compiled code of course.

flagged those include directories as "-system".

and some related files

migrated JobOptionsSvc, GaudiGS, GaudiMP, GaudiMTTools, GaudiUtils, PartPropSvc and RootHistCnv to new property declaration

getProperty(string,string) conflicts with an IProperty method

Allow retrieval of single properties from `JobOptionsSvc`.

Also removed the need of `PropertyMgr` in `RFileCnv`.

Changed PropertyMgr to allow to use it to implement IProperty interface via
multiple inheritance.

For example:

    ```.cpp
    class Algorithm: public implements<IProperty, INamedInterface, ...>,
                    public PropertyMgr {  // implements IProperty
      ...
    };
    ```

Changing from composition to (multiple) inheritance allowed removal of ~200
lines of code.

Works.
Not final version.

   - prefer nullptr
   - prefer auto
   - avoid comparing pointers to 0

fix bug identified by clang-tidy: missing [] leads to 'always true' because a pointer is tested instead of a value

    - qualify implementations with override instead of virtual
    - replace trivial destructors with = default
    - remove unused data members

Prefer SmartIF over bare pointers to interfaces, and the subsequent explicit updating of the refCount

  - use explict bool conversion instead of .isValid()
  - add SmartIF::as<IFace>(), to return a SmartIF to an alternate
    interface -- which (together with move) encourages the use of auto
  - add ServiceManager::service<IFace>() which return SmartIF<IFace> which encourages
    the use of auto

And add a few other C++11 modernizations (eg. prefer STL over raw loop)

   - avoid copy if const& will suffice
   - prefer std::to_string over ostringstream
   - prefer emplace_back over push_back