Include a "core update" shortcut in the installer

[bladeoflight16]

When you run update-core and it finds updates, it currently says

==> Checking if there are critical packages to upgrade.
bash 4.3.042-1 -> 4.3.042-2
msys2-runtime 2.2.1.16681.8ba11f6-1 -> 2.3.0.16690.4930b0d-1
==> Core packages require updating.
==> Please close all other MSYS2 derived windows (e.g. terminal
==> windows, Bash sessions, etc) before proceeding.
==> WARNING: When the update has completed, you MUST close this MSYS2 window
==> WARNING: (use Alt-F4 or red [ X ], etc.), rather than 'exit'!!!

This is a major improvement over what updating these packages used to require. So kudos for that, first. But to simplify my update process even more, I have a shortcut in my Start Menu that executes a cmd file with the following contents:

C:\msys64\usr\bin\bash -i -l -c "update-core"

@PAUSE

(Actually, I have the script inside of C:\msys64 and I use %~dp0usr\bin\bash, but you get the point.)

This makes my life a fair bit simpler since I don't have to worry about exiting. bash just exits when the update is done, I see the result, and I open MSYS2 to update the rest of my packages. I doubt I'm the only one who would find this useful. Please consider adding something similar to the installer.