ListView custom draw fixes

[Sam]

Hi,

This patch includes multiple small fixes to ListView control.

Changelog:
  - Fixed: CDDS_ITEMPOSTPAINT message was sent before any CDDS_SUBITEMPRE/POSTPAINT messages.
  - Text and text background color is saved between columns, and reset for each row.
  - Removed an optimization preventing ITEMPRE/POSTPAINT messages being sent, if the column was not visible.
    (Needed because text and background color is maintained between columns, and can be changed by the
     message handlers).
  - Fixed: Selection background drawing in list and report modes.

Sami Nopanen, sam at pcuf.fi
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