PluginLoaders not found for platform specific plugins

[Cheesebaron]

MvxAndroidSetup and the other platform setups look for a specific extension to the plugin assembly. So for Android it expects an assembly that is called MyPlugin.Useful.Droid where the Android implementation resides. If it doesn't find that, it doesn't try to fall back to anything else and then just explodes.

This happens due to when switching to Multi-target, the assembly names are now all the same for all assemblies. Platform specific or not.

@AlexStefan was very quick to provide a repro sample https://github.com/AlexStefan/template-app/blob/master/Internationalization/

The Core and Droid projects there point at MvvmCross in the folder ../../mc

Steps to reproduce 📜

1. Add one of the official plugins
2. Make sure Bootstrap is added
3. Load a ViewModel which uses that plugin
4. 💥 app crashes

Expected behavior 🤔

App should run

Actual behavior 🐛

App crashes

Configuration 🔧

Version: 6.0.0-beta2