update version and prepare publish

adjust tumbnail image sizing

Update HomeViewModel.cs

Update AboutViewModel.cs

add dynamic versiontext binding

fix misspells

adjust layouts about- helppage, add more details

register Testpage

setup thumbnail display on list entries

set binding for thumbnailurl in model

add thumbnailurl field @ videoentry model

Delete DownloadPage.xaml

Delete DownloadPage.xaml.cs

convert grid deffinitions to inline arguments

enable force portrait mode