win32ole.c, win32ole_event.c: Use class variables for internal data instead of global variables. Because global variables are visible by global_variables() method
win32ole.c: Call OleUninitialize() on exit to allow multi VM on one thread
win32ole.h: Add LL2NUM, ULL2NUM, NUM2LL and NUM2ULL macro that convert 64bit integer to mrb_value and vice versa.
Fix crash when defining MRB_INT64 macro
Avoid "arena overflow error" when defining MRB_GC_FIXED_ARENA
Add RbComTest
Fix tests for mruby-win32ole
Add ws2_32.lib to vcxproj