"get by name, tag" functions; update todo

TODO.md

@@ -2,6 +2,11 @@
 
 ## game data structure
 
+add "from_dir" functions for structs
+  make that function generic?
+
+-- 
+
 what is the distinction between animate and inanimate objects?
 
 idea: 
@@ -12,21 +17,7 @@ idea:
       * each position could have (optionally) a tile and (optionally) a thing
       * things have render priority
 
-### colours
-
-~convert colours to hex~
-* ~accept abcdef, #abcdef, 0xabcdef (inc. uppercase)~
-* ~export as #abcdef~
-
-### palettes
-
-### images
-
-* ideally support gif/png...
-
-### parser
-
-* ~move tests into their respective modules where appropriate~
+* ideally support gif/png for images (are there other indexed colour formats?)
 
 ## players
 
@@ -34,10 +25,6 @@ idea:
     * re-use player avatar drawing function as generic image drawing function
     * text (how?)
     * support older graphics adaptors
-    
-### linux
-
-* ~get working~
 
 ### windows