sfall 4.2.8.1

Maintenance release for v4.2.8.

Changelog:

• Fixed a few minor bugs introduced in 4.2.8
• Added support for drawing PCX images to draw_image, draw_image_scaled, and interface_art_draw script functions
• New script function: win_fill_color
• Cleaned up define_lite.h and command_lite.h in the modders pack