Add support for Groovy-4-style range expressions

[leonard84]

fixes #1956

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 81.83%. Comparing base (2c7db77) to head (4556a97).
Report is 95 commits behind head on master.

Files	Patch %	Lines
...n/java/org/spockframework/util/ReflectionUtil.java	50.00%	3 Missing ⚠️
...org/spockframework/compiler/ConditionRewriter.java	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1958      +/-   ##
============================================
+ Coverage     80.44%   81.83%   +1.38%     
- Complexity     4337     4572     +235     
============================================
  Files           441      446       +5     
  Lines         13534    14337     +803     
  Branches       1707     1813     +106     
============================================
+ Hits          10888    11732     +844     
+ Misses         2008     1939      -69     
- Partials        638      666      +28     

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[AndreasTu]

Thanks for the fix!