imm32: Improve ImmGetCompositionString.

[Aric Stewart]

It should return number of copied bytes. But it always returned required
buffer size to receive all information.
It didn't copy attributes and clause informations.
It didn't do necessary conversion except GCS_*STR.
FROM:  Kusanagi Kouichi <slash at ma.neweb.ne.jp>

includes a test of ImmGetCompositionStringA
---
  dlls/imm32/imm.c         |  207 
+++++++++++++++++++++++++++++-----------------
  dlls/imm32/tests/imm32.c |   28 ++++++
  2 files changed, 158 insertions(+), 77 deletions(-)


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