Process to remove unused handlers over time
*This bug was originally reported by Chris Lamb (lamby@debian.org) in Debian bug [#833603](https://bugs.debian.org/833603):* ``` As we fix various issues in packages and toolchains, the number of handlers in strip-nondetermism should eventually (!) drop to zero. I think we can speed this up by getting some visibility on which handlers are actually being used and pro-actively removing them when they drop below a certain level. One way we could do this would be to log that we applied $handler on $filename then that could be parsed by external tools. If it then appears more sensible to fix each package individually (ie. due to a low number of packages requiring it) or to attack the root cause of the problem (eg. some kind of toolchain fix), we can eventually remove the handler. ```
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