Update BScreen class style and variable names, remove documentation from Screen.cpp file, create Screen.dox documentation file

[jscipione]

This ticket updates the BScreen class renaming some variables to make them consistent with the header or related methods, adding some spaces and other style changes. Preceding underscores were removed from variable names in some cases. The documentation is removed from the Screen.cpp file and is added to the dox file instead. NO FUNCTIONAL CHANGES are intended. These changes to the BScreen class are to aid in the second part, adding BScreen to the Haiku book.

The second part of this ticket is a dox file for the BScreen class to be added to the docs/user/interface directory in order to add the class documentation to the Haiku Book. The documentation is not simply a copy of the documentation in the Screen.cpp file but has been updated significantly. I added the names of the people from the Screen.cpp file (Stefano Ceccherini and Axel Dörfler) to the Authors section Screen.dox file as well as myself.

[jscipione]

Patch to remove the documentation from the Screen.cpp file and rename some variables and other style updates. NO FUNCTIONAL CHANGE intended.

[jscipione]

Upon further reading of the style used in the source I found that the underscores in the parameters for GetBitmap() and GetModeList() were okay so I didn't remove them. The underscores in the params for GetMode() are not and they should be there for GetPixelClockLimits(). Still no functional changes intended.

[jscipione]

BScreen class documentation taking into account proper underscore method style.

[jscipione]

SetDesktopColor() should have a parameter named stick, not makeDefault

[nielx]

I am reviewing the doc!

[nielx]

Fixed in hrev42984.