Allow interception of multiple vcredit versions at the same time

[Kittyfisto]

Currently, the postmortem debugger can only be configured to handle CRT failures for a particular version. This means that if in the same process, there is a dll loaded against another CRT version and it produces an unhandled exception, then the postmortem debugger will not record any crash dump.

Ideally, the user should be able to simply install the postmortem debugger for all supported versions and be done with it.