VOYEUR: Fix for aborting out of sending someoneo the tape
QUEEN: Migrate listSaves() function to game target for save naming.
WII: Implement changes needed by DevKitPPC R26 and later

This changes makes ScummVM compilable with newer versions of DevKitPPC. ScummVM can be linked against the original libogc and libfat. That makes some newer WiiMotes work, improves audio-/video-playback and contains various improvements.
FULLPIPE: Implement sceneHandler38_hammerKick()
FULLPIPE: Implement sceneHandler38_point()
FULLPIPE: Implement sceneHandler38_propose()
FULLPIPE: Started implementation of sceneHandler38_animateAlcoholics()
WINTERMUTE: Enable Wintermute by default.
BUILD: Rename libunity support variable to "USE_UNITY" instead of "USE_TASKBAR_UNITY".

This makes it consistent with other library support variables.
BUILD: Auto detect taskbar support.

Formerly the taskbar support was *always* enabled except when the backend or
user specified that it should be disabled. This causes nasty crashes for
backends which do not have any taskbar support (like DC, Tizen and probably
more which simply did not disable it so far) when defaultErrorHandler was
called for example (Mass Add is also broken for those).
The SDL (and derived backends) worked around missing taskbar support by
simply faking a dummy taskbar implementation (but still claiming in configure
that we feature taskbar integration, ouch).

To avoid all non-SDL backends from manually specifying _taskbar=no I added
some auto detection code which simply only enables taskbar support in case
ScummVM is built on Win32 or libunity is present.
Merge pull request #413 from AReim1982/master

WII: Implement changes needed by DevKitPPC R26 and later
FULLPIPE: Complete sceneHandler38_animateAlcoholics()
Merge pull request #421 from lordhoto/taskbar-cleanup

BUILD: Taskbar Cleanup/Fixes
BUILD: Remove now superfluous _taskbar=no in Wii specific configuration.
OPENGL: Properly query for OpenGL errors.

There might be various error flags and we need to clear all of them to get
precise error results. Thus, we need to call glGetError in a loop to achieve
that.
AGOS: Slightly clean up ArchiveMan code.

This removes the (always true) _fallBack flag which determined whether
SearchMan should be searched.
AGOS: Get rid of ArchiveMan in favor of global SearchMan.

This in fact slightly changes the priority order of added archives. Formerly,
all archives in SearchMan were preferred to the customly added ones in
ArchiveMan. All standard paths (i.e. path and extrapath) will be still be
searched before the custom ones (which are all priority 0 right now) but system
specific paths will be searched after (due to their priority being -1). Since
system specific paths shouldn't contain any game data files this should
hopefully be harmless.

This wasn't tested for games with CAB archives.
AGOS: Use Common::File instead of SearchMan.

This makes sure the hack from Common::File for filenames with a trailing dot
is used as expected.
VOYEUR: Renaming of thread data pointers
AVALANCHE: Move kTune and TuneType to Dialogs.