TONY: Switch to 565 screen format.

The old (555) screen format is not supported by some backends.

This leaves the savegame thumbnails as 555 (for compatibility).
COMMON: Use true nullptr in Visual Studio 2010+ and true override in VS 2012+

Those compilers support these features despite not being fully C++11-compliant.

<http://msdn.microsoft.com/en-us/library/hh567368.aspx> says that VS 2010
has "partial" support for override. I don't know what that entails and I
can't test it, so I err on the side of caution and only enable it in 2012
and up.
GUI: Fix for bug 6719 (last line of help missing)

Since 1.4 the font changed from a 14 to 15 pixel height wich causes
one line of help text no longer to be shown. By changing the padding
of the buttons the last lines fits again.
GCW0: Create log file at game launch
GCW0: Create target with unstripped binaries
BASE: Display virtual keyboard and keymapper in game options
CONFIGURE: Create port-specific platform for GCW0
GCW0: Remove absolute paths
GCW0: Fix default joystick number
KEYMAPPER: Fix off-by-one error with keymapper action names
GCW0: Hardcoded (for now) GCW0 controls
GCW0: Switch to HW floats and introduce the platform define
Merge pull request #503 from BenCastricum/fixforbug6719

GUI: Fix for bug 6719 (last line of help missing)
QUEEN: Fix bug #6700 - "FOTAQ: Weird Response Glitches"

Pending mouse clicks and keypresses are now cleared before and after
the game options screen or dialog options are shown
QUEEN: Allow the engine to quit while dialog options are shown
SAGA: Remove the buggy actor swapping fixup code for IHNM

This was a hack that was implemented while IHNM was being developed.
That code should no longer be needed. If this issue does occur again,
the actual cause should be investigated, instead of hiding it with
workarounds. The code was buggy anyway, as _currentProtag was not
initialized properly
SCUMM: balloon - There is no spanish version.
SCUMM: freddi1 - Add support for 'FREDDI_ROBO' CD sold with Packard Bell PCs.
SCUMM: freddicove - Detect dutch game variant found on CD EAN 8716051020172
SCUMM: Identify several windows variants as such