Use quoted split pattern for barcodes

[magicDGS]

This commit separates the pattern for split barcodes sequences/qualities from the default String for the separator by quoting the java property (or default) argument. This have several advantages:

• Split will not fail after providing an special character (e.g., +)
• Combined barcodes will have the same separator as the one in RTDefaults
• Java property is not required to be a regexp
• Pre-compiled patterns might be faster (untested)

Closes #525

[codecov[bot]]

Codecov Report

Merging #526 into master will increase coverage by 0.011%. The diff coverage is 100%.

@@               Coverage Diff               @@
##              master      #526       +/-   ##
===============================================
+ Coverage     93.682%   93.693%   +0.011%     
+ Complexity      1077      1076        -1     
===============================================
  Files            103       103               
  Lines           2833      2838        +5     
  Branches         301       301               
===============================================
+ Hits            2654      2659        +5     
  Misses           133       133               
  Partials          46        46

Impacted Files	Coverage Δ	Complexity Δ
...s/readtools/utils/fastq/FastqReadNameEncoding.java	77.193% <100%> (ø)	16 <0> (ø)	:arrow_down:
...n/java/org/magicdgs/readtools/RTHelpConstants.java	88.889% <100%> (+0.517%)	13 <0> (ø)	:arrow_down:
...org/magicdgs/readtools/utils/read/RTReadUtils.java	98.413% <100%> (+0.039%)	51 <0> (-1)	:arrow_down: