Appearance Prefs: drag and drop between ColorWhichItems

Fixes final piece of #8618

Already added support for list items to drag colors out and you can
drag and drop between the list items and preview. but, what was
missing was drag and drop between list items. Updated
ColorWhichListItem to also accept color drops through their
parent ColorWhichListView.

Also included some related style fixes, use B_RGB_COLOR_TYPE
constant in place of (type_code)'RGBC'. 80-char limit fixes.

Simplify similar code in ColorPreview class to parse out rgb_color
from message.

ColorPreview passes dropped color along to APRView

APRView no longer accepts color drops, this is handled by ListView
and ColorPreview now.

Consolidated "RGBColor" and "which" message name strings into
constants defined in defs.h.

Change-Id: I88ec2a4ffe077620ec4cc3b032196cbff0f09615

Embedded the Font into the Appearance Preflet

* Copied the essential parts from the Font preflet into the Appearance
preflet folder.
* Adopted these files to better direct where BMessage arrive and why.
The Font preflet just forwarded them from the BWindow handler,
which was quite messy.
* Embedded the Font preferences as another tab. The first one actually,
with the Decor settings also moved in front of the Anti-Aliasing tab.
* Refactored the Defaults and Revert button updates in the window code.
* AInclude all active settings tabs in the Defaults and Revert handling
for consistency. But eventually, the buttons should only affect the
currently visible page.

Updating some Preferences MIME signatures.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32509 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch from Pier Luigi Fiorini for layouts of Appearance and Keyboard preferences


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22531 a95241bf-73f2-0310-859d-f6bbb57e9c96

Updated style to come pretty close to matching OT style guidelines


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19158 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed src/prefs to "preferences", as the directory is usually called in BeOS.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13263 a95241bf-73f2-0310-859d-f6bbb57e9c96

Embedded the Font into the Appearance Preflet

* Copied the essential parts from the Font preflet into the Appearance
preflet folder.
* Adopted these files to better direct where BMessage arrive and why.
The Font preflet just forwarded them from the BWindow handler,
which was quite messy.
* Embedded the Font preferences as another tab. The first one actually,
with the Decor settings also moved in front of the Anti-Aliasing tab.
* Refactored the Defaults and Revert button updates in the window code.
* AInclude all active settings tabs in the Defaults and Revert handling
for consistency. But eventually, the buttons should only affect the
currently visible page.

Updating some Preferences MIME signatures.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@32509 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch from Pier Luigi Fiorini for layouts of Appearance and Keyboard preferences


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22531 a95241bf-73f2-0310-859d-f6bbb57e9c96

Updated style to come pretty close to matching OT style guidelines


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19158 a95241bf-73f2-0310-859d-f6bbb57e9c96

Renamed src/prefs to "preferences", as the directory is usually called in BeOS.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13263 a95241bf-73f2-0310-859d-f6bbb57e9c96