GRIM/Movie: When seeking start decoding blocky16 from the keyframe.
GRIM: Fix use of uninitialized value.
MYST3: Add detection entry for v1.21 M3.EXE
GRIM: Move back the call to set the head lookat after animating the model.

That broke Glottis when he sings the tusty anchor.
GRIM: Fix volumes setting. Fix #710
GRIM: Set ModelNode::_initialized to true on node loading.
GRIM: Patch DATA002/use_ma_costume.cos. Fix #680
GRIM: Fix wrong sfx timing when emptying the turkey-baster (data000/si.lua)
GRIM: Fix bonewagon popping when driving in and out set tr
ALL: Update KNOWN_BUGS
GRIM: Reworked fi.lua.patchr to make it more slim
ALL: fix mac os x filename in snapshot
GRIM: Add a config option to disable ARB shaders: "use_arb_shaders", defaulted to true
DOCS: Document the use_arb_shaders option.
Merge pull request #713 from giucam/shadersoption

GRIM: Add a config option to disable ARB shaders
GRIM: Set the right type for integer registry keys
GRIM: Fix sfx volume when loading a savegame made during a movie.
GRIM: Patchr to fix the DOD door animation and duplicated sfx.
GRIM: Silence casting away const warnings
GRIM: Remove now unused _rootNode from Head