sofort: portable software project template
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motivation
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* take care of the elements that are common to all
  (of my) cross-platform C projects, and which, for
  the most part, do not (or at least should not)
  contain any project-specific bits:
  --> the build system;
  --> the argv parser and usage screen generator;
  --> the initial program driver;
  --> and initial front-end utility.
* zero external dependencies: the new project is
  generated from the template project using basic
  shell utilities, specifically cp, grep, and sed.

build system
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* the project is conceived as a library with
  an accompanying front-end utility.
* the configure script is fast and skinny,
  yet comprehensive.
* unified logic for native and cross builds.
* unified logic for in-tree and out-of-tree builds.

driver
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* the provided argv parser and usage screen generator
  is powerful, flexible, and thread-safe; moreover,
  it allows for a program driver that is entirely
  independent of the chosen skin.

skins
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* one benefit of the above design is that it allows the
  front-end utility to have several distinct skins at
  virtually no effort.

modularity
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* the distinct driver and unit context, in combination
  with the thread-safe argv parser, render the front-end
  utility's inclusion in a multi-call binary trivial.

extras
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* the template provides the skeleton of an application
  that may accept one or more files for its input, then
  operate on each input file individually.