openbor Tools

Rewrote the bilinear scaling filter. Like the previous version, this one has
both a C version and an MMX version. Unlike the previous version, the
copyright is owned by OpenBOR Team and it's not licensed under the GPL.

Removed the "Bilinear Plus" and "Motion Blur" filters. Both were
GPL-encumbered and rather useless as filters, and a poll of users didn't
show that anyone actually uses either one:

http://lavalit.com:8080/index.php/topic,7130.0.html

Add quake to level property.

Merge alpha 7 with alpha 6 (engine will check if channels are set).
Add tintmode and tintcolor to drawmethod, if tintmode is set, it tints the sprite with specific tintcolor and blend mode(defined by tintmode).

- Add alpha 7 (individual rgb channels) and corresponding drawmethod properties (channelr, channelg, channelb) and script changes.
- Twist drawmethod command to break it down to smaller ones instead of single long argument list.
- Edit macros in pixelformat.c to swap r and b with each other (r is actually b and vise versa).

Check anmations valid before changing model to prevent some crash.
Extend bbox and abox to 6 values for further use.

Restore #pragma pack(1) in anigif.h.

Add releasetime to entity property.

openborscript.c:
Fix aiflag and think for changeentityproperty os NULL() is now actually supported.
Add jumpheight as an entity property (set and change).
openbor.c:
Forgot to clear loading script, now it's fixed.
screen32.c:
Fix putscreenx8p32 color key bug.

Allow selecting the OpenGL filtering method (simple or bilinear) in
fullscreen. This was supposed to be allowed when I separated the video
settings for windowed and fullscreen in the save data, but I overlooked it
then.

Silence debug spew to stderr when processing joystick input. I added it a
long time ago for debugging purposes and apparently forgot to disable it. It
went unnoticed until now because the stderr stream is only visible when
running OpenBOR from a terminal in Linux or Darwin.