Two debounce attempts (recent-append recency, then sustained-unfocus
streak) both failed to stop it firing on almost every incoming line
while the toggle was on. Rather than keep chasing GetFocus() polling
noise, removed the whole feature: poll_output_focus, jump_notepad_to_end,
toggle_jump_to_end, the Ctrl+Alt+J accelerator/alias, the polling timer,
the jump_to_end_on_focus variable, and the now-unused GetFocus/
EM_SCROLLCARET Alien bindings. SmartAppendToNotepad (the actual smart-
scroll fix, unrelated to this and confirmed working) is untouched.
Updated the readme to drop the Ctrl+Alt+J entry.
f7477dc4c3