* eat.el (eat--t-term): New slots: 'prompt-start-fn',
'prompt-end-fn', 'cont-prompt-start-fn', 'cont-prompt-end-fn',
'set-cmd-fn', 'cmd-start-fn', 'cmd-finish-fn'
* eat.el (eat--t-set-cwd): Accept three arguments in two
different formats.
* eat.el (eat--t-prompt-start, eat--t-prompt-end)
(eat--t-cont-prompt-start, eat--t-cont-prompt-end)
(eat--t-set-cmd, eat--t-cmd-start, eat--t-cmd-finish): New
function.
* eat.el (eat--t-handle-output): Accept Eat's own
OSC 51 ; e ; ... ST sequences.
* eat.el (eat-term-prompt-start-function)
(eat-term-prompt-end-function)
(eat-term-continuation-prompt-start-function)
(eat-term-continuation-prompt-end-function)
(eat-term-set-cmd-function, eat-term-cmd-start-function)
(eat-term-cmd-finish-function): New generalized variable.
* integration/bash (__eat_current_command, __eat_exit_status):
New variable.
* integration/bash (__eat_prompt_command): Send exit status of
last command, if applicable. Use Eat specific sequence to
report working directory. Set title.
* integration/bash (__eat_preexec): Report current command and
execution start.
* integration/bash (__eat_before_prompt_command): Set
'__eat_exit_status' to the exit status of the last command.
* integration/bash (__eat_prompt_start, __eat_prompt_end)
(__eat_continuation_start, __eat_continuation_end): New
variable, used as constant only to make the code more readable.
* integration/bash (__eat_enable_integration): Wrap 'PS1' and
'PS2'. Don't set title from 'PS1'.
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