Add TODO.txt.

TODO.txt

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+TODO
+====
+
+Refactoring
+-----------
+
+* Replace ServiceLocator with Dependency Injection or be at least so honest to
+  use ordinary globals instead (no need to derive from Component).
+* Put (at least) core components in namespace jd to allow ADL: avoids ugly
+  forward declarations of operator<< before #include <luabind/operator.hpp>
+  and is good style anyway.
+* Replace the FileSystem singleton with free functions in a namespace.
+* StateManager / State needs to be completely rewritten: It's way to
+  complicated without providing any benefits and, worse, lowers flexibility.
+* Maybe replace jd.connect with a Lua function <-> luabind::object() converter
+  so that jd.connect() is not necessary anymore and
+  fooComponent:connect_bar(f) can be used instead.
+* Get rid of LuaComponent::bindLuaPart(): Maybe luabind::adopt() is now
+  capable of replacing it.