Rework solution structure to allow more types of library projects (#196)

* Rename avalonia & wpf samples

* Rename rest of samples

* fix sample readme

* Fix compat util tests

* rename / move all src projects

* remove package lock files and move libC# again

* Add rust lib and cargo workspace

* Replace locksmith lib with new filelocksmith-rs library

* Deprecated type

* fix setup compile

* Use thiserror for error handling

* Rename some enums and formatting

* Add missing SHA256

* wip c++ library

* cpp wip

* alphabetize readme

* Try to get build working again

* Fix some conditionally compiled bits

* cross config should be in workspace root

* Fix PathHelper for new rust target dir

* Missed one old path to velopack.csproj

* remove obsolete coverage code

* testawareapp.exe no longer exists

samples/CSharpUno/UnoSample/Presentation/MainPage.xaml

@@ -0,0 +1,39 @@
+<Page
+    x:Class="UnoSample.Presentation.MainPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:UnoSample.Presentation"
+    xmlns:uen="using:Uno.Extensions.Navigation.UI"
+    xmlns:um="using:Uno.Material"
+    xmlns:utu="using:Uno.Toolkit.UI"
+    Background="{ThemeResource BackgroundBrush}"
+    NavigationCacheMode="Required">
+
+    <Grid utu:SafeArea.Insets="VisibleBounds">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition />
+        </Grid.RowDefinitions>
+        <utu:NavigationBar Content="{Binding Title}" />
+
+        <StackPanel
+            Grid.Row="1"
+            HorizontalAlignment="Center"
+            VerticalAlignment="Center"
+            Spacing="16">
+            <TextBlock Text="The app is not installed with Velopack" Visibility="{x:Bind NotInstalled}" />
+            <TextBlock Text="{x:Bind ViewModel.CurrentVersion}" />
+
+            <Button
+                HorizontalAlignment="Center"
+                Command="{Binding CheckForUpdatesCommand}"
+                Content="Check For Updates" />
+            <Button
+                HorizontalAlignment="Center"
+                Command="{Binding DownloadUpdatesCommand}"
+                Content="Download Updates"
+                Visibility="{x:Bind ViewModel.HasUpdate, Mode=OneWay}" />
+            <TextBlock Text="{Binding Status}" />
+        </StackPanel>
+    </Grid>
+</Page>