msi: Implement MsiGetMode for MSIRUNMODE_SCHEDULED, MSIRUNMODE_COMMIT and MSIRUNMODE_ROLLBACK.

[Robert Shearman]

---
  dlls/msi/action.c  |   22 +++++++++++-----------
  dlls/msi/custom.c  |   20 +++++++++++++++++++-
  dlls/msi/events.c  |    2 +-
  dlls/msi/install.c |   14 +++++++++++++-
  dlls/msi/msi.c     |    6 +++---
  dlls/msi/msipriv.h |   10 +++++++---
  dlls/msi/package.c |    3 +++
  7 files changed, 57 insertions(+), 20 deletions(-)
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