Refactor global shortcuts, simplify debug consoles

- Move out all shortcuts from their central file to the component they
  actually belong to

- Get rid of DebugConsoleLoader and the multiple consoles handling mess,
  have only one global console

TODO.md

@@ -2,9 +2,6 @@
 
 ## Refactoring
 
-- Put keybindings in the components they belong to instead of shoving them
-  all in one central file
-
 - Rewrite account settings using `HTabbedContainer`
   - Get rid of all `currentSpacing` stuff
   - Use new default/reset controls system 
@@ -13,8 +10,6 @@
 - Split `HScrollableTextArea` into `HTextArea` and `HScrollView` components
 - Refactor `Composer`
 
-- Make sure we don't store any state in delegates
-
 - Drop the `HBox` `buttonModel`/`buttonCallbacks` `HBox` approach,
   be more declarative