Version 26: It's a BIG one!

This release adds over 50 new textures, taking the total to over 700! Also, it adds the first animated textures. For now almost all of the animated textures are various liquids, including water, green slime, brown sludge, purple ooze, and blood.

Full list of changes and additions:

• Added new slime variant.
• Added new ooze variant.
• Improved water textures variants.
• Improved sludge texture variants.
• Added animated versions of all 15 liquid textures.
• Added animated tech switch/console texture.
• Added 3 chequerboard variants: bloody, broken, and combined.
• Added 2 bloody wood variants.
• Added wooden fence variant (front and back).
• Added half-height, white picket fences, in 3 variants.
• Added rusty variants of large left/right wooden doors.
• Added alien support columns in 8 variants.
• Added shutters in 4 variants: plain, with sign, missing sign, and graffiti.
• Added concrete variant with graffiti.
• Added alien metal variant, with green warning and spotlights.
• Added jade green warning stripes: regular and worn.
• Added metal girders, in 4 variants.
• Added metal/wood crates, in 2 variants.
• Added purple alien spotlights, in 2 variants.