ole32: Create host apartments to enable isolation of objects of incompatible threading models.

[Robert Shearman]

There should be one host apartment per apartment. Existing apartments 
should not be re-used, except in the case of the main apartment.
---
  dlls/ole32/compobj.c         |  220 
++++++++++++++++++++++++++++++++----------
  dlls/ole32/compobj_private.h |    2
  dlls/ole32/tests/marshal.c   |    1
  3 files changed, 170 insertions(+), 53 deletions(-)
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