replace hard-coded class names with each instance of the classes

[whizark]

• cfs-network-support/src/Api.php

  Line 59 in 28aef9a

  return forward_static_call_array(['cfs_api', $name], $arguments);

• cfs-network-support/src/Api.php

  Line 72 in 28aef9a

  return call_user_func_array(['cfs_api', $name], $arguments);

• cfs-network-support/src/FieldGroup.php

  Line 59 in 28aef9a

  return forward_static_call_array(['cfs_field_group', $name], $arguments);

• cfs-network-support/src/FieldGroup.php

  Line 72 in 28aef9a

  return call_user_func_array(['cfs_field_group', $name], $arguments);