main: Convert signal handling to use context. #1712
Merged
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This requires PR #1710 and #1711.
This converts the signal handling and
dcrdMain
function to use a context with cancellation instead of a separate interrupt channel. It does not really make much of a difference yet, but the intent is to simplify the various subsystems in future commits by refactoring them to make use of the context versus manually handling start and stop in each subsystem.