Unloads the given class by clearing out its symbol table and removing
it from %INC.

SYNOPSIS

    use Class::Unload;
    use Class::Inspector;

    use Some::Class;

    Class::Unload->unload( 'Some::Class' );
    Class::Inspector->loaded( 'Some::Class' ); # Returns false

    require Some::Class; # Reloads the class