qutebrowser: Add maps for command mode navigation

Added ways of navigating the command mode similar to unix readline or
fzf lists.
^N / ^P will get you up and down the history / completion options
^J / ^K will get you up the last typed commands
^U / ^A / ^E / ^F / ^B / ^H manipulate the caret on the commandline.

qutebrowser/.config/qutebrowser/maps.py

@@ -13,6 +13,27 @@ config.bind("m", "mode-enter set_mark")
 config.bind("`", "quickmark-save")
 config.bind("~", "bookmark-add")
 
+config.bind("<Ctrl-J>", "command-history-next", mode="command")
+config.bind("<Ctrl-K>", "command-history-prev", mode="command")
+config.bind("<Ctrl-P>", "completion-item-focus prev", mode="command")
+config.bind("<Ctrl-N>", "completion-item-focus next", mode="command")
+config.bind('<Alt-Backspace>', 'rl-backward-kill-word', mode='command')
+config.bind('<Alt-D>', 'rl-kill-word', mode='command')
+config.bind('<Alt-F>', 'rl-forward-word', mode='command')
+config.bind('<Ctrl-?>', 'rl-delete-char', mode='command')
+config.bind('<Ctrl-A>', 'rl-beginning-of-line', mode='command')
+config.bind('<Ctrl-B>', 'rl-backward-char', mode='command')
+config.bind('<Ctrl-C>', 'completion-item-yank', mode='command')
+config.bind('<Ctrl-D>', 'completion-item-del', mode='command')
+config.bind('<Ctrl-E>', 'rl-end-of-line', mode='command')
+config.bind('<Ctrl-F>', 'rl-forward-char', mode='command')
+config.bind('<Ctrl-H>', 'rl-backward-delete-char', mode='command')
+config.bind('<Ctrl-Shift-Tab>', 'completion-item-focus prev-category', mode='command')
+config.bind('<Ctrl-Tab>', 'completion-item-focus next-category', mode='command')
+config.bind('<Ctrl-U>', 'rl-unix-line-discard', mode='command')
+config.bind('<Ctrl-W>', 'rl-unix-word-rubout', mode='command')
+config.bind('<Ctrl-Y>', 'rl-yank', mode='command')
+
 ## ADDED
 # toggles ('cycles') between tabs always showing, or only when switching between them
 config.bind(