io: add IOStreamer interface
app: extend FSM states
app: remove global g_mgr
base: remove global g_mgr. removed obsolete Base
app: hold properties by name of component
app: handle evtmax=-1 and io.EOF
core: simplify Component interface
app: remove obsolete SetName method
core: ComponentMgr can now create new components
core: introduce new PortMgr interface
app: make appmgr a PortMgr
core: make App a PortMgr. add Msg() method
app: add appmgr.Msg() method
register: change signature of component factory functions
app: change signature of component factory functions
dflow: change signature of component factory functions
store: change signature of component factory functions
app: cosmetics