nette / command-line

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Runner: added, which runs the program in the process: help, version, usage errors and the exit code

It adds --help with -h and, given a version, --version with -V, placed with the
options of the program, a flag of that name the program has being answered as
it is. A usage error is printed with the help of its command and returns 2 by
default. On request it prints the help for an empty line (helpWhenEmpty, before
the required arguments are demanded), adds --no-color, read before parsing so
that a mistake of the line is plain too (colorFlag), and reports an exception
of the handler by its message (errorExitCode). A version may be a closure
writing it for the console it goes to.

62 of 62 new or added lines in 2 files covered. (100.0%)

1231 of 1245 relevant lines covered (98.88%)

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