BToolBar: Convert to using Set*UIColor.

This was a bigger change than many others as BButton now defaults to using
control background colors, and we can not do that here without the buttons
not appearing as we desire (blending in with the toolbar).

Using the control background color for the toolbar would be unacceptable.

Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>
Patch 0041 from looncraz, unmodified.

BToolBar: made FindButton() public.

BToolBar: Add a "text" parameter.

For defining the text that appears alongside the icon.

This function really has too many parameters; we probably should break
it out into a BAction class...

BToolBar: misc. fixes.

* Move common init. code to an _Init() function.
* Create a layout constructor.
* Make _AddView public and rename it to AddView.

BToolbar: rename to BToolBar.

"BToolBar" matches the current convention ("BStatusBar", "BMenuBar", etc.)
I've no idea what I was thinking when I renamed this before...

Also adjust all users of BToolBar (Tracker and ShowImage).

BToolBar: made FindButton() public.

BToolBar: Add a "text" parameter.

For defining the text that appears alongside the icon.

This function really has too many parameters; we probably should break
it out into a BAction class...

BToolBar: misc. fixes.

* Move common init. code to an _Init() function.
* Create a layout constructor.
* Make _AddView public and rename it to AddView.

BToolbar: rename to BToolBar.

"BToolBar" matches the current convention ("BStatusBar", "BMenuBar", etc.)
I've no idea what I was thinking when I renamed this before...

Also adjust all users of BToolBar (Tracker and ShowImage).