Fixes#4041.
Show the version with tier and build flags in Setup so that it is clear
which version of Keyman will be installed, as the Keyman version can be
distinct from the setup.exe version.
Constructs the version tag from version+stability data in the
UpdateCheckResponse and uses a new MSI property called VersionWithTag
for Windows Installers. Older MSIs will still show a.b.c.d versions
instead of the tagged version if they are checked locally (as opposed to
online), because the new VersionWithTag property will not be present.
There were a number of obsolete values in setup.inf, and removing those
led to a small cascade of changes:
1. `MSIOptions` and `Version` properties were removed.
2. `Version` is now read directly from the .msi if it is present.
3. Package name and version are now read directly from local .kmp files,
rather than relying on metadata in setup.inf.
4. Setup now only loads .kmp files that are referenced in setup.inf, to
avoid scenarios where a user downloads the installer into a common
location that already includes .kmp files and is then confused by
why it is offering to install those files as well.
5. `Strings` property is not used outside of `TInstallInfo`.
