[jak2] More texture animations (#2831)

Added framework to do texture animations entirely in C++. Currently only
works on relatively simple ones, and doesn't handle updating all
parameters - only the speeds.

Connected texture animations to merc and tfrag for skull gems, dark
bomb, and scrolling conveyors.

Cleaned up Tfragment/Tfrag3, which used to be two classes. This was one
of the first C++ renderers, so it had a weird design.

decompiler/data/tpage.cpp

@@ -504,6 +504,12 @@ TPageResultStats process_tpage(ObjectFileData& data,
 
     if (animated_textures.count(tex.name) && !ignore_animated) {
       switch (tex.psm) {
+        case int(PSM::PSMCT32):
+          // no need.
+          break;
+        case int(PSM::PSMT4):
+          // currently not needed.
+          break;
         case int(PSM::PSMT8):
           ASSERT(tex.clutpsm == int(CPSM::PSMCT32));
           {