moved SAFE_DELETE to lib.h

dyn_array supports "wrapping" other types of memory (stopgap measure)
texture codecs now load via DynArray (intermediate step to all mem stuff
going through res/mem.cpp)
simplified tex codecs by doing as many checks as possible in
tex_load_mem ("template method"-esque)

This was SVN commit r2690.

source/graphics/Material.cpp

@@ -7,9 +7,6 @@
 #include "Game.h"
 #include "Overlay.h" // for CColor
 
-#define SAFE_DELETE(x) \
-	if((x)) { delete (x); (x) = NULL; }
-
 CMaterial NullMaterial;
 CMaterial IdentityMaterial;