- less confusion about stored settings

Update size info even if redrawing is disabled.
Trivial cleanups, and some tracing.

More debug tracing.

Do not store callback items for subitems, even if we're asked to.
Small cleanup.

Override custom draw bkgnd color for selection items.
Fill background for all items that have a bkgnd colour.

Reimplement SetRedraw to cope with the changes.

Add debugging helper for SCROLLINFO.
Fix potential bug in debugging helpers.

- silence errors

- add HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM default mapping
- remember old DirectX version strings

application.

Rename update_icon_size to set_icon_size, fix parameters order.
Assorted cleanups.

Mark a few things that needs looking at.
Small cleanup.

Assorted cleanups.

and faster when redraw is disabled.