msi: automation: Implement Installer::RegistryValue. [try2]

[Misha Koshelev]

Changes from previous version: Pulled registry value to variant code into variant_from_registry_value helper
function and condensed some of the if/else statements.
---
 dlls/msi/automation.c        |  186 +++++++++++++++++++++++++++++++++++++++-
 dlls/msi/msiserver.idl       |    5 +
 dlls/msi/msiserver_dispids.h |    1 +
 dlls/msi/tests/automation.c  |  199 +++++++++++++++++++++---------------------
 4 files changed, 290 insertions(+), 101 deletions(-)
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