entt: cleanup TODO file

TODO

@@ -32,6 +32,4 @@ TODO:
 * archetype-like a-là EnTT support (see my own notes)
 * meta: conversion_helper machinery has lot of room for improvements
 * organizer: view/storage only based model, no registry
-* refine tests: add prefixes (i.e. signal_delegate) or scope into their dirs
-* refine tests: create per-file scopes to avoid conflicts (ie const_nonconst_...)
 * introduce a way to inject stl from outside too