[REBAR] Add Chevron Support

[Robert Shearman]

Hi,

This patch adds support for chevrons in the Rebar common control. The chevron 
doesn't actually look like a chevron at the moment (it is a copy of the 
toolbar drop-down arrow) due to my lack of drawing skills.
In order for the chevron to show up the child control has to be wider than 
the rebar itself. The child control is usually a toolbar with 
TBSTYLE_EX_HIDECLIPPEDBUTTONS enabled (patch coming for this).

Changelog:
- Add chevron support
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