Core: Anim_utils: allow ParentSpaceTransfer to be executed outside anim_picker

[miquelcampos]

Here is a snippet on how to use it

from mgear.core import anim_utils
import mgear.pymaya as pm

namespace =  "Girl_Rig_02"
model = "rig" # this can be any node, but recommend to be the top node
model_with_namespace = namespace +":"+ model
ui_host = "armUI_L0_ctl"
combo_attr = "shoulder_rotRef"
control = "arm_L0_fk0_ctl" # the control that will track the space. we can define any control

# for IK/FK this list is always 2 items ["IK", "FK"] and is hardcoded, but for space transfer can be anything
# using this existing function we can collect the combo names, but we need to remove the last one as it adds the special key "++ Space Transfer ++" at the end
key_list = anim_utils.getComboKeys_with_namespace(
            namespace,  ui_host, combo_attr)[:-1]

anim_utils.ParentSpaceTransfer.showUI(
                key_list,
                model_with_namespace,
                ui_host,
               combo_attr,
                control,
            )