REACH-115 Separate SaveUploader into Model layer and View layer

`BaseSaveUploader` is base class for `NWKSaveUploader` one. `BaseSaveUploaderView` isn't base for `NWKSaveUploaderView`.
It's me :) Masha is informal form of my name. My account on PC is called this way, that's why IDE adds comments with this name by default when I add new file into the project