count: make value buffer-local, font-changing commands.

* count.el (count-mode-value): Make this variable buffer-local, so
  that we can have different buffers count different values.

  (counting-font-step): Add a variable that controls the font-size
  scaling factor within the counting buffers.  I shall consider if I
  need to make this variable buffer-local as well.

  (count-mode, count-refresh): Refactor some logic into the function
  `count-refresh`.

  (count-mode-map): Add bindings for font-size changing commands.

  (count-make-pad-string): Account for the font-size scaling variable
  in the calculation of the size of the numbers to be centered.

  (count-enlarge, count-shrink): Commands for changing the
  font-scaling variable, so as to achieve the effect of enlarging and
  shrinking the texts within the counting buffers.

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