Fix accessible output window, revert Tab/Ctrl+Space, sync readme keys

- output_functions.xml: merge NotepadSmartScroll's Win32/Alien-based
  smart-scroll logic in directly (was a separate plugin). Fixed the
  caret-restore bug: gating the restore on scroll position was wrong
  since the notepad tracks near the bottom during normal reading; now
  gated on whether the caret was literally at the end of the old text.
  Added a jump-to-end-on-focus toggle (Ctrl+Alt+J) with a 0.2s polling
  timer to catch focus landing on the output notepad by any means.
- Reverted the Tab/Ctrl+Space rebinding - removed switch_to_output and
  trigger_word_completion along with their accelerators.
- cosmic rage.MCL: dropped the dangling NotepadSmartScroll.xml include
  (file no longer exists, was reintroduced by an auto-save).
- readme.md: documented the actual current CosmicRage.xml keys (several
  had drifted out of sync - Alt+F12 is now stop-sounds not restart,
  Alt+Delete/Ctrl+S/Ctrl+F1-3/Alt+F3/Alt+Shift+H/F11 were undocumented)
  and added the output_functions.xml accessible-output keybindings,
  which weren't documented at all before.

cosmic rage/worlds/plugins/MushReader.xml

@@ -298,6 +298,10 @@ function OnPluginScreendraw(t, log, line)
   -- checking for an empty string, or a string composed only of spaces.
   -- If we don't, NVDA says blank.
   if (t == 0 or t == 1) and not line:find("^%s*$") then
+    if GetVariable("skip_speech") == "1" then
+      SetVariable("skip_speech", "0")
+      return
+    end
     if subst.status==0 then
       return
     end