This function will copy all methods and attributes, except
the container, and the instantiate method. Then, the ..init_call.. attribute
will be set to the current system call, and the ..instantiated.. attribute
will be set to TRUE. Notice, the ..init.. method will not run.
Examples
BASE$..new..()
#>
#> ── <BASE object>
# Inherit from BASE
TEST <- new_class(BASE, class_name = "TEST")
TEST$..new..()
#>
#> ── <TEST object>