* set_gfx_command part 2
* part 3
* get gfx/vtx from name; copy gfx/vtx
* gfx/vtx dynamic allocation lua
* gfx/vtx_new: don't take level/model/vanilla names
* Clean up gbi constants
* update example
* Isaac review; add gfx_get_next_command and vtx_get_next_vertex
* make all commands length 1; missing NULL checks
