Unified interface for attributes

In this MR, I propose a more unified attributes handling.

This MR, once merged, will break every other MR!

Refactor

• Use the term "attribute" instead of "parameter"
• Uniformized function naming ("hasAttr" and "getAttr" + "addAttr"/"setAttr"/"delAttr" for DynamicAttributes)
• Parametrizable -> StaticAttributes
• CParameter -> DynamicAttributes
• Adding abstract class Attributes to uniformize Dynamic & StaticAttributes

Also

• Includes fix for bug #8 (closed) (as it may get lost in MR !9 (merged))
• Distinguish between "addAttr" (asserts if already exists) and "setAttr" (do not care if already exists)
• "Universal" Python binding for DynamicAttributes
• Added AIDGE_THROW_OR_ABORT macro

include/aidge/utils/DynamicAttributes.hpp

@@ -183,6 +183,10 @@ private:
 
 #ifdef PYBIND
     // Stores C++ attributes (copy) and Python-only attributes
+    // Code should be compiled with -fvisibility=hidden
+    // See https://pybind11.readthedocs.io/en/stable/faq.html:
+    // “‘SomeClass’ declared with greater visibility than the type of its 
+    // field ‘SomeClass::member’ [-Wattributes]”
     std::map<std::string, py::object> mAttrsPy;
 #endif
 };