Reload modules when rebuilding with the same name

[aulemahal]

Generic Issue

Currently, when building a virtual submodule, if the name already exists, the existing one is simply updated with the built indicators.
This means that when re-building a module after having removed a few indicators from the yaml, these indicators still appear in the update module and thus are iterated over with iter_indicators. We should have an option to "reset" the module, without having to restart the python kernel.

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