[decomp] cleanup drawable and ocean stuff (#414)

* use `kmalloc-flags` for goal `kmalloc`

* cleanup some drawable stuff, add offline tests

* cleanup generic-h a bit

* make decompiler work on 16-bit static data

* cleanup ocean stuff

* fix `ocean-spheres`

* oops forgot this

* I forgot to actually make `ocean-tables`

game/kernel/kmalloc.cpp

@@ -167,7 +167,7 @@ Ptr<u8> kmalloc(Ptr<kheapinfo> heap, s32 size, u32 flags, char const* name) {
 
     heap->top.offset = memstart;
 
-    if (flags & 0x1000)
+    if (flags & KMALLOC_MEMSET)
       std::memset(Ptr<u8>(memstart).c(), 0, (size_t)size);
     return Ptr<u8>(memstart);
   }