Fix mods screen initialization being slow with many mods #790
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Resolves #727.
Changes the check for whether a mod has a config screen to check whether a config screen factory is available, and defers actually constructing individual config screens until the user actually clicks the configure button.
As a side-effect broken config screens are no longer reported on until the user has tried opening the config screen at least once, but I think this should be an acceptable change considering the improved user experience otherwise.