winex11drv: Distinguish left and right keys for shift, ctrl and alt. (try 4)

[Vitaliy Margolen]

This time with lots of tests that exposed number of other problems that were fixed.

I could not separate this patch into separate pieces - they all linked together and
fixing one problem meant fixing or breaking something else. This especially related
to the tests that test everything together as a one black box.

There are still few problems remain that could be exposed by tightening tests.
---
 dlls/user32/message.c       |   17 ++
 dlls/user32/tests/input.c   |  430 +++++++++++++++++++++++++++++++++++++------
 dlls/winex11.drv/keyboard.c |   76 +++++---
 server/queue.c              |   15 +-
 4 files changed, 444 insertions(+), 94 deletions(-)
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