Add generic test application framework

This patch adds a generic test application framework to Lima, usable:

• at the HwInterface level through HwTestApp class, providing basic callback and saving capabilities, and
• at the CtControl level through the CtCtestApp class, providing many capabilities exported to the user through the Control Layer and used by the Tango/Python interface

Many LimaCore parameters needed a formalization of C++ I/O stream serialization operators.