promote content scope to base layer, rename as 'access'; generalize based just on list of scope refcounts, + optional cvs; eliminate c_scope; replace dasm_scope with access as well

src/texture_cache/texture_cache.c

@@ -266,7 +266,7 @@ tex_u2x_dequeue_req(U128 *hash_out, TEX_Topology *top_out)
 ASYNC_WORK_DEF(tex_xfer_work)
 {
   ProfBeginFunction();
-  C_Scope *scope = c_scope_open();
+  Access *access = access_open();
   
   //- rjf: decode
   U128 hash = {0};
@@ -297,7 +297,7 @@ ASYNC_WORK_DEF(tex_xfer_work)
   String8 data = {0};
   if(got_task)
   {
-    data = c_data_from_hash(scope, hash);
+    data = c_data_from_hash(access, hash);
   }
   
   //- rjf: data * topology -> texture
@@ -322,7 +322,7 @@ ASYNC_WORK_DEF(tex_xfer_work)
     }
   }
   
-  c_scope_close(scope);
+  access_close(access);
   ProfEnd();
   return 0;
 }