Customise PluginListComponent::scanFinished message

Would be it be possible to add a way to customise the message shown when there are plugin files that fail to scan?

Note that the following files appeared to be plugin files, but failed to load correctly

Is confusing a lot of our users as this is shown if any 32-bit plugins are attempted to be scanned in a 64-bit app or if they accidentally try and scan some other dlls.

Just a method to set the string on PluginListComponent that defaults to the above would probably suffice and not break existing behaviour.