(resend) imm32: rework storage of thread default contexts

[Aric Stewart]

any thread needs to be able to access the default context for any other 
thread in the process for ImmGetContext.

includes tests for ImmGetContext and ImmAssociateContext regarding 
threads and processes
---
  dlls/imm32/imm.c         |  162 
+++++++++++++++++++++++++++++++++-------------
  dlls/imm32/tests/imm32.c |   73 +++++++++++++++++++++
  2 files changed, 189 insertions(+), 46 deletions(-)


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