7.2.800

[BUGFIX] Don't produce invalid IL when --callContext indicates a method with a non-void return (issue #105, and probably #26 too)
[BUGFIX] Restore application icons, even if they only show in the .exe forms (lost in 7.1.795 if not before)
[BUGFIX] Add AltCover prefix to MSBuild property names NetCoreEngine, NetStdEngine (global), InputDirectory and OutputDirectory (target-scoped) in the injected .targets file for dotnet test integration.
[BUGFIX] Let the AvaloniaUI based visualizer roll forwards from netcoreapp2.1 onto later runtimes
Finer-grained control of the coverage summary output
When --callContext indicates an async method, then track all calls within the same async flow, and not just in the direct same-thread call stack. Note other out-of-thread calls (Thread.Start, Parallel.Invoke, explict Async-named method invocation, ...) are not tracked.
Build with net5.0 SDK (modulo work-round for dotnet/fsharp#10442) in net5-only environments
- Still build AltCover.exe/.dll against net472 for framework support, netcoreapp2.1 for the global tool and netcoreapp2.0 for everywhere else
- Still build the GTK2 visualizer against net472 for consistency
- Still build the recorder at net20 and use that assembly everywhere (see F# compiler issue noted above) except where a net46 version is substituted for tracking through async calls
- Move unit tests to net5.0, as they are not public API

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