implemented PRINTER_INFO_2 request.

- cleaning up icon cache on PROCESS_DETACH
- fixed ascii/unicode use in SH/ILCreateFromPath
- fixed small memory leak in shellview

painting depend on the update region, reworked SetWindowPos() and
RedrawWindow() to speed up update region calculation, made -desktop
work properly, added WM_CANCELMODE here and there, fixed several
window activation bugs that crept in since the last time.

Xlib_DirectDrawCreate.

Fixed memory leak in waveOutOpen/waveOutClose.

Now uses ICOM_THIS to access the implementation structures.
Replaced 'this' with 'This' for ICOM_THIS.
Direct access to the virtual table has been eliminated too.

in the public includes.

Modified to use the latest ICOM macros.
Added the macros for use in C.
Added the method parameter names (when I had them).

Moved PE_MODREF flags to WINE_MODREF level.
Better handling of LoadLibraryEx flags.
PE_InitTls() changed to work only on the current thread.

CreateToolbarEx. Implement partially the hot buttons for toolbar.

- showing the selected tab as highlighted
- support for drawing the focus rectangle
- basic keyboard support
- support for a tab with horizontal scrolling.