Move Observer/Observable to utils

[alkino]

Still on the purpose of removing IVOS (copy of interviews).

This Observer/Observable should one day be replace by signal/slot because it will be more meaningful.

FROM

class Foo: public Observable
{
  virtual void update(Observable*);
  virtual void disconnect(Observable*);

};

class Bar: public Observer {
  void Attach(cTemplate*, Observer*);
  void Detach(cTemplate*, Observer*);
};

TO

class Foo {
  signal onNewMessage(cTemplate*);
};

class Bar {
  Bar() {
    foo.onNewMessage.connect([](cTemplate*) {}); 
  }
};

[sonarcloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[bbpbuildbot]

Logfiles from GitLab pipeline #201035 (:no_entry:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ✅ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ✅ test:neuron:nmodl:intel:shared
• ⛔ test:neuron:nmodl:nvhpc:acc:legacy
• ⛔ test:neuron:nmodl:nvhpc:acc:shared
• ⛔ test:neuron:nmodl:nvhpc:omp:legacy
• ⛔ test:neuron:nmodl:nvhpc:omp

[ohm314]

looks reasonable. your suggestion to move towards signal/slot should go into an issue so we can address it later.

[ohm314]

obviously - assuming the build errors get figured out :)