lisp/subr.el (right-arrow-command, left-arrow-command): Move to bindings.el.
lisp/bindings.el (right-char, left-char): Move from subr.el and
rename from right-arrow-command and left-arrow-command.
(right-word, left-word): New functions.
(global-map) <right>: Bind to right-char.
(global-map) <left>: Bind to left-char.
(global-map) <C-right>: Bind to right-word.
(global-map) <C-left>: Bind to left-word.
doc/emacs/basic.texi (Moving Point): Update due to renaming of commands bound
to arrows. Document bidi-aware behavior of C-<right> and C-<left>.
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