various code cleanup/API imporvements

- fix naming to separate public/private API (double dashes)

- simplify variables manipulation with `alist-get`

- store frame and tab information in variables instead of names

    External manipulation, such as killing is handled via listening to
    `kill-buffer-hook`. Renaming by user is irrelevant since we don't
    rely on names. Information is tied directly to the buffer object.

- group code into semantically different sections

- remove obsolete/redundant behaviour

- move configuration procedures (such as `add-hook`) to the end of
file. Otherwise, some symbols might happen to be undefined in hooked
functions.

- remove tco mentions

Author: temyurchenko

README.org

@@ -70,14 +70,11 @@ See further discussion at [[https://babbagefiles.xyz/equake-elisp-console/][the
 
 * Installation
 Unless you're installing via Melpa, make sure you have the following
-external dependencies installed: [[https://github.com/magnars/dash.el][ =dash= ]], [[https://github.com/Wilfred/tco.el][ =tco= ]].  This might be
+external dependencies installed: [[https://github.com/magnars/dash.el][ =dash= ]].  This might be
 accomplished via [[https://github.com/jwiegley/use-package][ =use-package= ]], e.g.:
  #+begin_src elisp
 (use-package dash
  :ensure t)
-
-(use-package tco
- :ensure t)
  #+end_src
 ** Melpa