Decouple cli / refactor

[sverweij]

goals

• cli should only directly depend on index.js
• cli should indirectly only depend on modules in parse and render (and possibly external modules)
• render and parse should only depend on themselves (& possibly external modules)

  changes

• moves one-off functions (sanitizeBooleanesque, swap, swapfromto) back to the respective packages in which their used, so now the utl/utensils module is replaced by a loads custom bulld.
• copies the extension guesser to the cli package - which makes it easier to move cli into a neat separate (npm) module/ package.
• adds function calls at the right abstraction level to index.js:
  • renderMsc - which takes an msc program, parses it and renders it.
  • translateMsc - which takes an msc program and translates it into another msc program or dot or doxygen
  • for both:
  • sensible defaults should make em easy to use.
  • accepts mscgen, xu, msgenny and json as 'msc program'

[codecov-io]

@@            master    #222   diff @@
======================================
  Files           37      37       
  Stmts         7284    7305    +21
  Branches         0       0       
  Methods          0       0       
======================================
+ Hit           6687    6710    +23
  Partial          0       0       
+ Missed         597     595     -2

Review entire Coverage Diff as of d6e116d

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