dinput: Fix mouse to use proper offset when queuing new events. Add handling of X-buttons.

[Vitaliy Margolen]

We should use instance IDs instead of sequential numbers to get correct
offset.
---
 dlls/dinput/device.c         |   12 +++++-
 dlls/dinput/device_private.h |    1 +
 dlls/dinput/mouse.c          |   88 +++++++++++++++++++++---------------------
 3 files changed, 55 insertions(+), 46 deletions(-)
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