[DEVOPS-217] AppVeyor: build and package cardano-node.exe (#1207)
[DEVOPS-217] AppVeyor: build and package cardano-node.exe (#1207)

* [DEVOPS-217] Verify built EXEs are where expected.

Anticipating this will fail on cardano-node.exe.

* [DEVOPS-217] AppVeyor: 'stack install cardano-sl'

input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype