openbor Tools

Minor change: don't use transform for sprites that only use centerx and centery drawmethod properties.

Avoid clobbering the ebx register in GetMMX since Darwin uses it as the PIC
register.

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.