A defer command as a bash loadable builtin

[Léa Gris]

I implemented defer as a bash loadable builtin.

It is a wrapper over the trap builtin that chains handlers on signals 
instead of replacing them (LIFO order):

https://github.com/leagris/bash-loadable-defer

Posting here in case it is of interest or worth considering as a core 
builtin feature.

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Léa Gris