unify name and module on Attached property

- setting the attribute using the name of an attached module
- getting the attribute results in the module object

+ change names iodev to io, iodevClass to ioClass,
  sendRecv to communicate, HasIodev to HasIO

Change-Id: I200b63a5a7dc1453bf6ac998782b065645201900
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/27575
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

cfg/ls370sim.cfg

@@ -1,24 +1,23 @@
-[node LscSIM.psi.ch]
+[NODE]
+id = LscSIM.psi.ch
 description = Lsc Simulation at PSI
 
-[interface tcp]
-type = tcp
-bindto = 0.0.0.0
-bindport = 5000
+[INTERFACE]
+uri = tcp://5000
 
-[module res]
+[res]
 class = secop_psi.ls370res.ResChannel
-.channel = 3
-.description = resistivity
-.main = lsmain
-.iodev = lscom
+channel = 3
+description = resistivity
+main = lsmain
+io = lscom
 
-[module lsmain]
+[lsmain]
 class = secop_psi.ls370res.Main
-.description = main control of Lsc controller
-.iodev = lscom
+description = main control of Lsc controller
+io = lscom
 
-[module lscom]
+[lscom]
 class = secop_psi.ls370sim.Ls370Sim
-.description = simulated serial communicator to a LS 370
-.visibility = 3
+description = simulated serial communicator to a LS 370
+visibility = 3