Add CommandLineParserConfig

[magicDGS]

For configuring the behavior of the CommandLineParserclass, a new config interface is included and the CommandLineParserOptions removed. The interface include defaults for all the methods and can be used directly, or a custom implementation that allows to configure using system properties, hard-coded values, etc.

The idea is simple: default methods can be overridden in toolkits to provide their own implementation for (at this moment):

• Argument expansion file extensions: this will be good for avoiding the change in Add suppressFileExpansion property to @Argument. #125 regarding default extensions, and solving the second point of Allow barclay list auto-expansion to be disabled using an @Argument attribute, disable it for -L in GATK , and add back .list as an acceptable extension for list files gatk#4165 without changing the default of barclay itself
• Append to collection, which solves the GATK/Picard difference in how collections are handled.

In the future, this might include also other configuration (e.g., special arguments to be allow to change the names and/or hide arguments - solving for example #123 without changing barclay).

[codecov-io]

Codecov Report

Merging #126 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master   #126   +/-   ##
=======================================
  Coverage        76%    76%           
- Complexity      591    592    +1     
=======================================
  Files            22     22           
  Lines          2205   2205           
  Branches        456    456           
=======================================
  Hits           1676   1676           
  Misses          352    352           
  Partials        177    177

Impacted Files	Coverage Δ	Complexity Δ
...e/barclay/argparser/CommandLineArgumentParser.java	82.75% <100%> (ø)	181 <0> (ø)	⬇️
...ute/barclay/argparser/CommandLineParserConfig.java	100% <100%> (ø)	2 <2> (?)
...titute/barclay/help/DefaultDocWorkUnitHandler.java	71.91% <100%> (ø)	75 <0> (ø)	⬇️

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