Mostly, removal of old code that had been commented out instead of
removed

This reverts commit fb05343e.

Caused by one occurence of "uniboardtool" having been replaced by
"OpenboardTool" instead of "openboardtool".
For consistency's sake, this was changed to openboardtool, but these URL
/ application name changes require a clean-up (all occurences of
"uniboardtool" are commented out; these should either be removed, or the
changes reverted)

The project didn't compile on Windows.. list of modifications:

- Added essential changes that hadn't been committed / pushed (Qt4->Qt5
changes; other misc. changes by Abdel)
- Temporarily disabled podcasts, as the modules don't compile with Qt5.2/
5.5

Currently, the application compiles on Windows, with MSVC2010 32-bit

removed redundant OBCocoa files / namespace; moved functions to UBPlatformUtils, which serves the same purpose

Application compiles and runs, with some caveats. Full list of changes:

- minor changes related to Qt4->Qt5 API differences

- Replaced calls to Carbon framework by Cocoa

- Removed registering of AE event handler. Seems to be done
automatically in Qt5.

- temporarily removed Podcast functionality, pending (presumably)
complete re-write due to Quicktime being obsolete in newer OS X
versions.

- Created OBCocoa namespace, and associated files src/core/OBCocoa.h/.mm, to
handle OS X - specific system calls. Currently used only by
UBApplication, but can in the future provide a useful interface between
the cocoa framework and OB, to avoid having too much OSX-specific code
in various files

Q_WS_MACX -> Q_OS_OSX
Q_WS_MAC -> Q_OS_OSX
Q_WS_WIN -> Q_OS_WIN
Q_WS_X11 -> Q_OS_LINUX

Removed deprecated QPlastiqueStyle. Replaced by stock Fusion style (new in Qt5). Change this to keep the custom look defined in UBStyle?

Desktop mode is broken
SANKORE-633
Positioning of floating palettes inside layers .