When .NET 5 comes, the TargetFrameworkMoniker will change, and we need the
entire moniker to distinguish between various platforms.
So change our msbuild code to consume the entire TargetFrameworkMoniker, so
that we have all the information we need when we need it.
Also redirect everything through an intermediate
_ComputedTargetFrameworkMoniker property, so that the target framework can be
overridden without affecting any other code. This becomes necessary during the
initial implementation phase, because we don't have a .NET version to test
with yet that can give us the new target frameworks. Eventually it should be
possible to remove this intermediate variable
This allows us to replace Xamarin.MacDev.Tasks.PlatformFramework with
Xamarin.Utils.ApplePlatform.
It also allow for more complex target framework handling/parsing in the
future, using the TargetFramework class.
* [msbuild] Improve altool task by logging execution errors
The altool task was just logging the XML output produced by the tool execution but was not logging any build error neither failing in that case.
* [msbuild] Log the altool output when failing to parse it
Rolf Bjarne Kvinge
Waleed Chaudhry
Oleg Demchenko
Emanuel Fernandez Dell'Oca