Lots of changes to MvxAdapter

- switched usage to IMvxAdapter in the list, grid, linearlayout, relativelayout, etc
- provided more inheritance permutations for linearlayout, relativelayout, etc
- provided more virtual methods inside the MvxAdapter (not sure these should be used but...)
- created IMvxAdapterWithChangedEvent to mirror IMvxAdapter changes
Bringing spinner into line with latest IMvxAdapter changes
Additional virtuals added to android container - plus init changed slightly - additional trace also added
BindingEx nuget pack added (wp and winrt only)
BindingEx nuget pack added (wp and winrt only)
Android dialog resources added and some view classes fixed
Minor cahnges to binding to allow dialog to load more smoothly
AutoView changes to get dialog working too
3.0.7 nuspec changes
push and pack for Droid Dialog
Wpf uses trace for debug output - fixes #275 for WPF (not for the other platforms!)
Trace added for unserializable types