add console.get(...) & add 'player' console variable

doc/en/console.md

@@ -4,7 +4,7 @@ To work with the command interpreter, use the **console** library.
 
 When sending a command via the standard console (core:console layout):
 1. the `allow-cheats` rule is checked
-2. the `pos.x|y|z`, `entity.id`, `entity.selected` variables are automatically set.
+2. the `player`, `pos.x|y|z`, `entity.id`, `entity.selected` variables are automatically set.
 3. the command handler is called - console.submit or the default one.
 
 The default handler calls console.execute, passing the result to the console.log call.