UartHal: STM32: resetInterruptFlags => acknowledgeInterruptFlags
Timer: STM32: Basic: acknowledgeInterruptFlags [plural]
doubly linked list: implement erase()
Merge branch 'develop' into feature/gui

Conflicts:
	src/xpcc/container/doubly_linked_list.hpp
	src/xpcc/container/doubly_linked_list_impl.hpp
Merge branch 'feature/gui' of https://github.com/roboterclubaachen/xpcc into feature/gui