Make using Edmacro easier for long sequences of keys

Make using Edmacro easier for long sequences of keys

* lisp/edmacro.el (edmacro-set-macro-to-region-lines)
(edmacro-reverse-key-order): New command and user option to
make working with longer lists of keys, such as from
'kmacro-edit-lossage', easier.
(edit-kbd-macro): Move regexps used to identify parts of
buffer to internal variables.
(edmacro--macro-lines-regexp, edmacro-mode-font-lock-keywords):
Allow noting whether the most recent line of keys is displayed
first.
(edmacro-mode-map): Bind the new command to 'C-c C-r'.
(edmacro-mode): Describe the new command in the mode
documentation string.

* doc/emacs/kmacro.texi (Edit Keyboard Macro): Mention
'edmacro-insert-key' and the newly added
'edmacro-set-macro-to-region-lines' and
'edmacro-reverse-key-line-order'.

* etc/NEWS (Edmacro): Add section describing the new features.

(Bug#65605)