[Neo VM Style] Add comments and document to reference counter

[Jim8y]

Description

Neo VM reference counter is a very important component, but it is very complex and is hard to understand. Making it actually UNMAINTAINABLE. Thus having this pr that adds detailed explaination and comments to all its related code.

Fixes # None

Type of change

• Optimization (the change is only an optimization)
• Style (the change is only a code style for better maintenance or standard purpose)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Test Configuration:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[shargon]

I think that we should wait for #3328 before merge it, because of conflicts

[Jim8y]

I think that we should wait for #3328 before merge it, because of conflicts

should be fine, its just comments.

[vncoelho]

Can you revert this change from here?

[Jim8y]

Problems like this are very minor, not worth a pr to fix, but if we don't fix it, it will always be this unclear syntax.

[vncoelho]

Fix in another PR, it is better.
Let just comments here

Even the underscore could be moved to another PR.

[vncoelho]

Looks good, @Jim8y

There is just a minor change to be reverted I think