Supply interfaces for lifting other transformers in SyncSFs

[turion]

Dunai's exception handling has been ported to Rhine's SyncSFs with some boiler plate code. This is still missing for most other transformers (e.g. #13 is a subissue of this).

The main issue is always that one can't directly apply the functions from Dunai's Control.Monad.Trans.MSF.*, since in a SyncSF, the outermost monad layer is ReaderT.
So one needs to commute some transformer past the outermost ReaderT layer of SyncSF,
then handle it, and possibly commute it back.
Doing this in a systematic way (e.g. a type class) would maybe clean up code and simplify progress.