allow PhyComponents to receive commands
add generic metadata header
add testcase for metadata class
adapt datastructures etc. to new metadata layout
Merge branch 'genericmetadata' into next
Merge remote-tracking branch 'origin/next_phycomponentcommands' into next
allow PhyComponents to wait for commands
allow PhyComponents to wait for commands
Merge branch 'next_phycomponentcommands' into next