LibCore: Make Core::Object properties more dynamic

Instead of everyone overriding save_to() and set_property() and doing
a pretty asymmetric job of implementing the various properties, let's
add a bit of structure here.

Object properties are now represented by a Core::Property. Properties
are registered with a getter and setter (optional) in constructors.
I've added some convenience macros for creating and registering
properties, but this does still feel a bit bulky. We'll have to
iterate on this and see where it goes.

Libraries/LibCore/CMakeLists.txt

@@ -19,6 +19,7 @@ set(SOURCES
     Notifier.cpp
     Object.cpp
     ProcessStatisticsReader.cpp
+    Property.cpp
     puff.cpp
     SocketAddress.cpp
     Socket.cpp