Add new `input-decode-map' keymap and use it for temrinal

Add new `input-decode-map' keymap and use it for temrinal
escape sequences.
* keyboard.h (struct kboard): Add Vinput_decode_map.
Remove Vlocal_key_translation_map.
* keyboard.c (read_key_sequence): Add support for input-decode-map.
(init_kboard): Init input-decode-map.
Replace local-key-translation-map back with key-translation-map.
(syms_of_keyboard): Declare input-decode-map.
Remove local-key-translation-map.  Update docstrings.
(mark_kboards): Mark Vinput_decode_map.
Don't mark Vlocal_key_translation_map.
* keymap.c (Fdescribe_buffer_bindings): Describe input-decode-map.
Replace local-key-translation-map back with key-translation-map.
* term.c (term_get_fkeys_1, CONDITIONAL_REASSIGN):
Bind in input-decode-map rather than function-key-map.