Add stacktrace always to unexpected errors

[magicDGS]

This commit prints always the stacktrace for unexpected errors, because their messages usually are not useful for the user but can help debugging without re-running with --verbosity DEBUG

In addition this commit removes the PrintStream fields in Main, which were only visible for testing - now there are methods in the test base class to capture stderr/stdout in an easier manner.

Closes https://github.com/magicDGS/ReadTools/issues/514

[codecov[bot]]

Codecov Report

Merging #517 into master will decrease coverage by 0.007%. The diff coverage is 100%.

@@              Coverage Diff               @@
##              master     #517       +/-   ##
==============================================
- Coverage     93.556%   93.55%   -0.007%     
  Complexity      1077     1077               
==============================================
  Files            103      103               
  Lines           2840     2837        -3     
  Branches         302      302               
==============================================
- Hits            2657     2654        -3     
  Misses           137      137               
  Partials          46       46

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/magicdgs/readtools/Main.java	83.333% <100%> (-1.515%)	15 <2> (ø)