SCUMM: Implement original AD AdLib output.

This implements the original AD output and enables it for Indy3 and Loom DOS.
It is not enabled for Monkey Island DOS because it would break multi MIDI
support. However, there are also drawbacks for Indy3. In the catacombs
we were able to play sfx (Indy walking around) and the background music
at once. This was not supported in the original player and thus also does
not work with this reimplementation.

This fixes bug #2027877 "INDY3: Non-Looping Sound Effects".
This fixes bug #1159581 "ADLIB: Adlib Emulation doesn't Respect Volume Settings"
for Indy3 and Loom.
I18N: Move specification of engine specific files to enginedir/POTFILES.

This allows to keep the engines to specfiy the files for translation close to
the engine sources itself.

Thanks to criezy for his suggestion on this approach.
GRAPHICS: Added changes and improved code from inisider/scummvm (partial text)

Includes code from https://github.com/inisider/scummvm/ , which has been
squashed and bugfixed
GRAPHICS: Add support for Soft Shadows with rounded squares
GRAPHICS: Shadows on tabs
GRAPHICS: Change soft-shadow calculation to not use doubles
GRAPHICS: Gradient blending on borders of rounded squares
TIZEN: updates for tizen 2.2 SDK
Merge pull request #386 from chrisws/tizen_port_1_6_1a

TIZEN: updates for tizen 2.2 SDK
DRASCULA: Some renaming. Also, get rid of some extraneous globals

This removes the superfluous talkHeight, talkWidth and timeDiff
variables. It also changes _loadedDifferentChapter to be a boolean
TSAGE: Fixes for speaking to Seeker and donning suit in R2R landing bay
SCI: Fix bug #3614914 - "SCI: Castle of Dr Brain Spanish crashes after Computer Room"

Ignore the unused x/y displacement fields of cels embedded in pics.
Dr. Brain Spanish, pic 261 contains garbage in these fields (probably
left overs)
TSAGE: R2R - Fix Locker 2 status in landing bay (Scene 500)
SCI: Fix script bug #3604939 - "SCI: QFG1VGA: Game hangs when meeting Baron while sneaking"
AGI: Adding detection for original AGI Tetris by Peter Kelly.
WINTERMUTE: Adding detection for more games.
GRAPHICS: Add missing "break"s in switch, CID 1063214

This won't actually make any difference, since the fall through
would do nothing and then reach the break in the default case. But
I think it's less error-prone this way if the code is ever modified.
Merge pull request #385 from JenniBee/md5s

AGI, WINTERMUTE: Adding detection for several more fan games.
MORTEVIELLE: Avoid a crash related to speech during the ending sequence of the German version
MORTEVIELLE: Fix display of ending speech in German DOS edition