function shouldLoadDebugVariant(sModuleName) {
		if (fnIgnorePreload) {
			// if preload is ignored (= partial debug mode), load the debug module first
			if (fnIgnorePreload(sModuleName)) {
				return true;
			} else {
				// partial debug mode is active, but not for this module
				return false;
			}
		} else {
			// no debug mode or standard debug mode
			return bDebugSources;
		}
	}
Whether the loader should try to load the debug variant
of a module.
This takes the standard and partial debug mode into account.

@param {string} sModuleName Name of the module to be loaded
@returns {boolean} Whether the debug variant should be loaded