[fixes #44956565] PlateTransfer use TransferAction mixin
[fixes #44956565] don't change aliquot type in case of Solvent
[fixes #44956565] removed the Solvent related change
[fixes #44956565] fixed missing session variable
Merge pull request #140 from ke4/44956565_refactor_platetransfer_to_use_the_transferaction_mixin

[fixes #44956565] PlateTransfer use TransferAction mixin