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tools\win\setenv.bat is a mostly unknown but sometimes useful batch file
that adds the VS tools to the path. It respects the value of
DEPOT_TOOLS_WIN_TOOLCHAIN and the current toolchain hash. This change
updates it to add support for VS 2019, and remove support for VS 2015.
It also takes away support for selecting 32-bit versus 64-bit target
toolchains because this feature was never used and was too much work to
support (since the packaged toolchain and vcvarsall.bat flags are
different).

This change also fixes a bug where the name of the batch file would be
retained in the command-prompt title after this script exits. Using the
"call" command fixes that. The retained title is ultimately a Windows
command prompt bug which is not going to get fixed. Adding the call
command then requires quoting the command path in the Python script.

Change-Id: I2b4943dc1e391d9fb4a9e76dd8b592223dc31fb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392013
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#804940}