add parameter 'context' to OWX_Execute (allows to correlate requests and responses in AfterExecuteFn)

git-svn-id: http://medialab-karlsruhe.dyndns.org/repos/FHEM/branches/async@285 9855b078-7087-11e0-8b26-2f3a526cf534
fix OWX_Execute use of executor and OWX_AfterExecute detection of AfterExecuteFn

git-svn-id: http://medialab-karlsruhe.dyndns.org/repos/FHEM/branches/async@286 9855b078-7087-11e0-8b26-2f3a526cf534
add support for execute 'context' and firmata 2.5 1-wire correlationid

git-svn-id: http://medialab-karlsruhe.dyndns.org/repos/FHEM/branches/async@287 9855b078-7087-11e0-8b26-2f3a526cf534
use OWX_Poll as ReadFn to receive asynchronous messages from OWX_Executor

git-svn-id: http://medialab-karlsruhe.dyndns.org/repos/FHEM/branches/async@288 9855b078-7087-11e0-8b26-2f3a526cf534
fix usage of AfterExecute readdata

git-svn-id: http://medialab-karlsruhe.dyndns.org/repos/FHEM/branches/async@289 9855b078-7087-11e0-8b26-2f3a526cf534
Merge branch 'async_local' into refactoring_async