Require .NET Framework >= 4.7.2 on Windows. #16324
Merged
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This PR raises our baseline .NET requirement on Windows from 4.5 to 4.7.2, working towards #15954.
.NET 4.7.2 is the minimum that Microsoft recomments for .NET standard 2.0 [ref], and does not drop support for any of our supported Windows versions [ref].
I have a few more commits locally that improve the Windows packaging by updating NSIS to 3.0.3 to fix #11865 and add HiDPI support to the installer. This change requires a switch to the Ubuntu 16.04 Travis VMs, which breaks the Mono 4.6.2 runtime we currently depend on. This therefore needs to wait until we merge this PR, #16319, #16316, and then bump our Travis runtime to 5.10.0.