surface: Added ability to toggle F15's wing force debug graphics.
Added callback function for adding custom members to EntityRegister.
surface: Adapted EntityRegister's sq_defineInt() for use by F15.
Added sqGet() and sqSet() accessors to Entity to be overridden.
Imported motioner project source.

The project is for creating motion files that can be loaded into
VastSpace program.  It has codes that should be shared among the
main source.

The wtltest subdirectory reimplements the GUI with Windows Template
Library.  You'll need WTL 8.1 installed in a subdirectory of parent
directory of the repository to compile the project wtltest.vcproj.
motioner: Added project files for VC2012.
motioner: Added project files of wtltest for VC2012.
motioner: Made the resource script ResEdit editable.

Don't forget to add atlres.h to the include files in the rc.
motioner: Merged mqo.cpp to main source to reduce duplicate codes.

The original headers (under include/) had bugs that rendered them not
portable, which were also fixed in this commit.
motioner: Fixed garbage characters caused by string format change.

This was caused by the previous commit's change which migrates old
Model class format to new one utilizing dstring for bone names.
motioner: Merged mqodraw.cpp to main source, too.
surface: Added LOD and aileron motions to F15's model.
surface: Made F15 motions take effect in VastSpace program.

There is a problem in visibility interpolation for Level of Detail
control, which should be fixed in the next commit.
Fixed Motion interpolation to make F15's LOD work properly.
surface: Added F15's elevator motion.
surface: Add F15's rudder motion
Convert EOL style of libmotion.h to LF for the next commit
Fix libmotion.h fail to compile with Linux gcc since 58947a
surface: Re-activate atmospheric pressure query in Aerial.
surface: Add landing gear model and motion to F15.

You can expand or retract the gear with G key when controlling a
F15.