Filter parameterless PIs, and introduce sync RI

- The auto-generated GUIs currently do not support parameterless
interfaces, so they must not appear in the "mini-cv.aadl" file. They can
be handled directly by the gui code.
- Support of Sync RIs, there are two cases (1) the calls to set/reset
  timers, that can be handled directly by the gui code and (2) the calls
to real external code, that has to be provided by the user and linked
with the shared library. An example of this second case is included in
demo-simu.
Add paramless TM and TC in regression test
Add explicit dereferencing in parameterless calls

Ada: When calling an access procedure with no parameter, it seems
mandatory to add ".all" to the call. Not understood why it is not needed
when the procedure has parameters.
Support for parameterless TM