Commit Briefs
ev: protect from timers that delete themselves
delete the timer before running the callback: code in net.c may end up deleting the current timer from the timer' callback.
ev: switch to poll(2)
ppoll(2) may not be available and we don't really need sub-millisecond precision.
remove the dependency on utils.c from a few binaries
telescope-identity(1) and the tests don't need it anymore.
move imsgev & co to their own file
This avoids bringing the dependency on ev on telescope-identity(1) and the tests as well.
net: re-enable asr_run
Make asr_run() work on top of ev. While here, rename the function names and add real error checking.