Timer expiration handling removed from EVENT_WaitNetEvent loop.

- small drawing fixes

WINPOS_ActivateOtherWindow.

  drivers. They are all seen as drivers, loaded as DLLs and standard
  module loadorder is used to know which type to use (builtin vs
  native).
- first full working implementation of mmThread??? functions (to
  support gracefully native MCI drivers).
- support of mmShowMMCPLPropertySheet.
- fix of some heap validate bugs (thanks to Ulrich for reporting them).

line names (try longer and longer strings).

- some fixme's for missing A<->W conversion

Fixed HEADER_InsertItemA and HEADER_InsertItemW null pointer checking
to handle wide character strings properly.  Fix of our previous patch
for null pointer checking.

the ILockBytes interface based on an HGLOBAL.

Fixed LISTVIEW_GetItemChanges() to perform a more complete comparison
between lpItem and lpLVItem.  Now compares the pszText string of the
lpItem and lpLVItem structs.  Fixes a bug where the old and new item
have the same attributes but their text differs and GetItemChanges()
compares them as equal.

property sheet.

locks the window, calls the real wndproc, unlocks the window.

TranslateMDISysAccel16.

defined to (empty) for compilers that do not have it.