WIP: win32: support 'bst show' with buildbox-casd and just enough signal support
Clear some of the problems up that arise when we try to handle signals we are not going to receive on win32.
Support the experimental win32 'buildbox-casd' port.
This enables us to run bst show
.
Depends on !1638 (merged).
Edited by Angelos Evripiotis