[properties] Deprecate macros
- Emit a deprecation warning from property macros header
- Add a pre-processor variable DUMUX_ENABLE_OLD_PROPERTY_MACROS which default to true
- Add description and explanation when to remove what
You can disable the warning by setting DUMUX_ENABLE_OLD_PROPERTY_MACROS=0. This will become the default after release 3.1.
Fixes #600 (closed)