Update: Use PHP namespaces

Update: Use PHP namespaces

This enables the use of PHP namespaces.
The namespaces must be prefixed with 'n_'.
The parent namespace for koopa is 'n_koopa'.

I intend to only use a single depth namespace of n_koopa to keep it simple.
All other names remain unchanged.

This introduces a few problems/caveats:
1) Functions being stored as strings to be called dynamically now need to have '/n_koopa/' in front of them.
2) The standard index file in implementing projects, such as reservations, must still use namespace 'n_koopa' even if their project is different.
- This is because the base classes will call the c_base_defaults_global class.
- All other implementing project files can have their own namespace.
3) Core PHP classes very likely need to have '\' prefixed to them (will update as I encounter them).

This introduced new resolutions:
1) Using namespaces revealed a bug in my code where a class function get_roles() is called on an object that may potentially be a c_base_return_false object.
- I have to review the code and confirm whether or not the code should always be returning the appropriate class or allow other returns.
- For now, I am just adding a quick instance check.