ROIseries Array vectorized method calls

[NiklasKeck]

Implement ROIseries_Array object to make e. g. the following possible:
[<ObjHeapVar...(ROISERIES_1D)><ObjHeapVar...(ROISERIES_1D)>]=[<ObjHeapVar..(ROISERIES_3D)><ObjHeapVar..(ROISERIES_3D)>].SPATIAL_MIXER("MEAN")
For implementation ideas and reasons why this is a good idea: cp. rs_wine_tasting.pro