* lisp/term/xterm.el: Fix xterm-paste handling for rxvt

* lisp/term/xterm.el: Fix xterm-paste handling for rxvt

* lisp/term/rxvt.el: Require term/xterm.
(rxvt-function-map): Use xterm-rxvt-function-map.
(rxvt-standard-colors): Move before first use.
(terminal-init-rxvt): Use xterm--push-map and xterm-register-default-colors.
(rxvt-rgb-convert-to-16bit, rxvt-register-default-colors): Remove.

* lisp/term/xterm.el (xterm-rxvt-function-map): New var.
Move shared bindings between rxvt and xterm to it.
(xterm-function-map): Use it.  Move the xterm-paste binding to
xterm-rxvt-function-map (bug#20444).
(xterm-standard-colors): Move before first use.
(xterm--push-map): New function.
(xterm-register-default-colors): Take standard colors as argument.
(terminal-init-xterm): Use it.  Adjust call to
xterm-register-default-colors.