config: use AccountConfig for all Account classes

src/CMakeLists.txt

src/account.cpp

src/account.h

src/account_config.cpp

src/account_factory.cpp

src/account_factory.h

src/client/configurationmanager.cpp

src/config/yamlparser.cpp

src/config/yamlparser.h

src/connectivity/sip_utils.h

src/jamidht/CMakeLists.txt

src/jamidht/Makefile.am

src/jamidht/jamiaccount.cpp

src/jamidht/jamiaccount.h

src/jamidht/jamiaccount_config.cpp

src/jamidht/jamiaccount_config.h

src/manager.cpp

src/manager.h

src/meson.build

src/sip/CMakeLists.txt