Gradle7 java11+ Support

[lacinoire]

These changes re-enable Gradle Support for DSpot. I adapted the automatic builder & tests to fit Gradle 7 and am actively using it with gradle in test-cube.
Unignored a lot of the existing test cases around Gradle 🙂

I tested DSpot with Java 11 and Java 16 (16 only as jdk with the test) and added the new compatabilities to the readme.
Java 11 works well, for Java 16 the funcitonality of running tests with maven is currently failing (though that might be my maven setup)

Shortened the readme by putting the long command line options in a default-collapsed <details> tag 🙂

[danglotb]

Hello @lacinoire

Thank you very much for the changes, look awesome. Waiting for the CI! 😄

[lacinoire]

CommentTest.testAmplifierComments failed again :/

In my next PR I tried making this test less specific (only checks for the comment, not for the exact modified line), so it should pass also when slightly different tests are generated during the tests. (👉🏼 https://github.com/TestShiftProject/dspot/blob/0038e9f82a590b0be5c05742b6a1962b21f2fc7a/dspot/src/test/java/eu/stamp_project/dspot/common/configuration/options/CommentTest.java#L126)
Those changes include the ones from this PR, so I'm waiting with opening until this one is merged 🙂

[codecov-commenter]

Codecov Report

Merging #1003 (64eef46) into master (5597805) will increase coverage by 1.74%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1003      +/-   ##
============================================
+ Coverage     71.25%   72.99%   +1.74%     
- Complexity     1460     1487      +27     
============================================
  Files           134      134              
  Lines          6359     6359              
  Branches        757      757              
============================================
+ Hits           4531     4642     +111     
+ Misses         1490     1379     -111     
  Partials        338      338              

Impacted Files	Coverage Δ
...common/automaticbuilder/gradle/GradleInjector.java	70.23% <ø> (+44.04%)	⬆️
...on/configuration/options/AutomaticBuilderEnum.java	100.00% <0.00%> (+20.00%)	⬆️
...ct/dspot/amplifier/SimpleInputAmplDistributor.java	98.48% <0.00%> (+25.75%)	⬆️
...utomaticbuilder/gradle/GradleAutomaticBuilder.java	80.00% <0.00%> (+80.00%)	⬆️

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[danglotb]

Thank @lacinoire
Waiting for your next contributions with impatience 😄
Good job there!