Add support for lazy loading of giomodules
Adds an optional query method to giomodules which should return all possible extension points the module may implement. Then we add a new call g_io_modules_scan_all_in_directory() similar to g_io_modules_load_all_in_directory() that doesn't return all loaded modules, thus allowing lazy loading. In g_io_modules_scan_all_in_directory we look for an optional giomodule.cache file and use the information in that to avoid loading modules until they are needed for an extension point.
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