feature Add net6.0 support

[ChrisPulman]

What kind of change does this PR introduce?

feature

What is the current behaviour?

support up to net 5

What is the new behaviour?

basic support for net 6

What might this PR break?

as Net 6 is still preview, features subject to change

Please check if the PR fulfils these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[codecov]

Codecov Report

Merging #2887 (f37ae1f) into main (c629a31) will increase coverage by 0.22%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2887      +/-   ##
==========================================
+ Coverage   71.96%   72.19%   +0.22%     
==========================================
  Files         144      140       -4     
  Lines        5008     4905     -103     
==========================================
- Hits         3604     3541      -63     
+ Misses       1404     1364      -40     

Impacted Files	Coverage Δ
...activeUI.Uwp/Common/AutoDataTemplateBindingHook.cs	94.44% <ø> (ø)
...eUI.Uwp/Common/BooleanToVisibilityTypeConverter.cs	70.58% <ø> (ø)
src/ReactiveUI.Uwp/Common/PlatformOperations.cs	0.00% <ø> (ø)
src/ReactiveUI.Uwp/Common/ReactivePage.cs	0.00% <ø> (ø)
src/ReactiveUI.Uwp/Common/ReactiveUserControl.cs	90.90% <ø> (ø)
src/ReactiveUI.Uwp/Common/RoutedViewHost.cs	86.44% <ø> (ø)
src/ReactiveUI.Uwp/Common/ViewModelViewHost.cs	83.33% <ø> (ø)
...iveUI/Platforms/net/ComponentModelTypeConverter.cs	52.77% <ø> (ø)
.../ReactiveUI/Platforms/net/PlatformRegistrations.cs	57.14% <ø> (ø)
src/ReactiveUI/Mixins/DependencyResolverMixins.cs	94.44% <100.00%> (+0.10%)	⬆️
... and 2 more

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.