More TODOs.

TODO.md

@@ -32,6 +32,8 @@
 - rename newcontrol.[cm] to control.[cm] or something else?
 - use _UI_EXPORT on OS-specific functions
 	- make their headers generated by an IDL
+- make sure complain()s don't have \n at the end; add one on each platform
+	- add a `[libui]` to the beginning of the message
 
 ultimately:
 - add some sort of runtime type checking