Lazily resolve plugins during scanning
There are two advantages: - scanning uncached plugins is much faster, - plugins with broken dependencies are visible in the modules list. Plugins are still resolved "now" if they are probed by module_need(). This is a safety feature (the run-time linker would exit silently if it hit an unresolved symbol). As the previous commit unloads all uncached plugins, we can reload the plugins with different flags as needed. Plugins with broken/missing underlying libraries will trigger an error only when used, rather than when scanned. vlc-cache-gen is then a bit more robust against messed up packages installation (it will not skip plugins anymore). Also, dialog_Fatal() could be used to report run-time errors. This was not possible previously: the error would occur before the UI was started. Note that this is not implemented on Windows, as there is no support (that I know) for lazy resolution of DLLs.
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