Add unit (milliseconds) to escape-time, show unset colours as "none"
rather than "invalid" and don't show the same text twice for user
options in customize mode.

Fix user option lookup ordering.

Stop caring about empty commands, just treat as a null command.

Add different command historys for different types of prompts
("command", "search" etc). From Anindya Mukherjee.

Add a flag to disable keys to close a message, GitHub issue 2625.

Permit shortcut keys in buffer, client, tree modes to be configured with
a format; the default remains the line number. GitHub issue 2636.

Hide some warnings on newer GCC versions, GitHUb issue 2525.

Some other warnings, GitHub issue 2382.

Add a -d option to display-message to set delay, from theonekeyg at
gmail dot com in GitHub issue 2322.

Check all lists if option not found already.

d and D keys to reset to default in customize mode.

Separate key flags and modifiers, log key flags, make the "xterm" flag
more explicit and fix M- keys with a leading escape.

Expand target from client and use it to expand the prompt.

Add a customize mode where keys and options may be browsed and changed,
includes adding a brief description of each option. Bound to "C" by
default.