StaticMessageQueue: inherit from MessageQueue
StaticMessageQueue: inherit from MessageQueue

This effectively reverts ec56e17362ac88d355c43e313eba9a493352947b - now
correct order of construction and destruction is guaranteed by proper
use of unique_ptr.
jasmin-j/distortos,DISTORTEC/distortos,jasmin-j/distortos,DISTORTEC/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos