Rework Class Creature, Cylinder and Item from Raw Pointer to Smart Pointer

[alysonjacomin]

• Change from Raw Pointer to Smart Pointer (Shared Pointer in this cases);
• Use enable_shared_from_this for compatibility with Shared Pointer;
• Use "weak_ptr" when necessary;
• Create using "Class_ptr" for each Class;
• Keep the object alive and send only the reference to subsequent functions with "Class_ptr&" to get the best performance + good naming semantics;
• Create virtual function on Class Thing "getClass()" for each Class and Sub-Class, this way we avoid using dynamic_cast which is more expensive.

[ranisalt]

We're (me and @ramon-bernardo) are halfway there in https://github.com/ranisalt/forgottenserver/pull/9 but there are a few issues still. I'm going to open a PR here when it's done

[alysonjacomin]

I hadn't seen that branch!

Very good, I'll take a look and try to contribute some details as well

[ramon-bernardo]

Not directly related to shared_ptr, but we intend to remove Cylinder class 😃 (https://github.com/otland/forgottenserver/pull/5058)

[alysonjacomin]

@ramon-bernardo In this case, are you continuing what was started in PR #5022 ?

[ramon-bernardo]

@alysonjacomin something that is present in the shared PR and we reviewed it for another

[ranisalt]

The smart pointer PR is just getting split so it's easier to track issues and review