[Comctl32] Fix header control

[Maxime Bellengé]

This patch implements HEADER_SetBitmapMargin and HEADER_GetBitmapMargin.
It also fixes the drawing of images from the imagelist, an image from
the imagelist behaves like a bitmap so it must support the
HDF_BITMAP_ON_RIGHT flag.

Max

Changelog:
  * Implements HEADER_SetBitmapMargin and HEADER_GetBitmapMargin
  * Get rid of some magic numbers in HEADER_DrawItem
  * Fixes the drawing of images from imagelist when the
HDF_BITMAP_ON_RIGHT flag is set.

-- 
Maxime Bellengé <maxime.bellenge at laposte.net>
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