Revert "fix wrong usage of container class in xpcc:Queue"

This reverts commit 7405f9688ae6ca935dd5b0d8a1e464e6afb3b650.

Better solution is to change the interface of LinkedList.
Change interface of LinkedList::append and add unit test for return value of BoundedDeque::append()
Peripheral: Adc: STM32F3: fix missing inlines
Peripheral: Clock: STM32F3: APB1 Timers are twice as fast
Merge branch 'develop' into feature/gui