set material specific settings

TPU, PP and PVA have a lower retraction count then default. PP-170

resources/quality/ultimaker3/um3_bb0.8_PVA_Verydraft_Print.inst.cfg

@@ -15,6 +15,7 @@ variant = BB 0.8
 brim_replaces_support = False
 layer_height = 0.3
 material_standby_temperature = 100
+retraction_count_max = 5
 support_brim_enable = True
 support_infill_sparse_thickness = 0.3
 support_interface_height = 1.2