openbor Tools

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.

Rewrote the Scanline 2x and Scanline TV 2x scaling filters to fix conflicts
with the GPL.