This commit introduces support for key bindings containing keys
traditionally classified as "OEM" keys. It uses VkKeyScanW and
MapVirtualKeyW, and translates the modifiers that come out of
VkKeyScanW to key chord modifiers.
The net result of this is that you can use bindings like "ctrl+|" in
your settings. That one in particular will be reserialized (and
displayed in any menus) as "ctrl+shift+\". Admittedly, this is not
clear, but it _is_ the truest representation of the key.
This commit also moves the Xaml key chord name override generator into
App as a static function, *AND* it forces its use for all modifier
names. This will present a localization issue, which will be helped in
part by #1972. This is required to work around
microsoft/microsoft-ui-xaml#708. I've kept the original code around
guarded by a puzzling ifdef, because it absolutely has value.
Fixes#1212.
