Misc changes to reduce use of `(lambda...); and other cleanups.
* lisp/cus-edit.el: Use lexical-binding. (customize-push-and-save, customize-apropos) (custom-buffer-create-internal): Use closures. * lisp/progmodes/bat-mode.el (bat-mode-syntax-table): "..." are strings. * lisp/progmodes/ada-xref.el: Use setq. * lisp/net/tramp.el (with-tramp-progress-reporter): Avoid setq. * lisp/dframe.el: Use lexical-binding. (dframe-frame-mode): Fix calling convention for hooks. Use a closure. * lisp/speedbar.el (speedbar-frame-mode): Adjust call accordingly. * lisp/descr-text.el: Use lexical-binding. (describe-text-widget, describe-text-sexp, describe-property-list): Use closures. * lisp/comint.el (comint-history-isearch-push-state): Use a closure. * lisp/calculator.el: Use lexical-binding. (calculator-number-to-string): Make it work with lexical-binding. (calculator-funcall): Same and use cl-letf.
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