change: map chars for collectibles K -> C

dev/TODO.md

@@ -2,12 +2,6 @@
   - Show moves on the screen
 - Change sprites for top and bottom borders
 - ESC to quit (what's the point)
-- Map chars:
-  - 0 empty
-  - 1 wall
-  - C collectible
-  - E exit
-  - P snas start position
 - Map conditions
   - 1 exit
   - 1+ collectibles