Rework lombok.config handling

[larsgrefer]

fix #311
close #307
close #293
close #249
close #250
close #265

[codecov]

Codecov Report

Merging #312 (ceffc90) into master (fd3551a) will decrease coverage by 0.08%.
The diff coverage is 70.42%.

@@             Coverage Diff              @@
##             master     #312      +/-   ##
============================================
- Coverage     28.98%   28.89%   -0.09%     
- Complexity      142      143       +1     
============================================
  Files            77       77              
  Lines          2025     2052      +27     
  Branches        190      191       +1     
============================================
+ Hits            587      593       +6     
- Misses         1384     1403      +19     
- Partials         54       56       +2     

Impacted Files	Coverage Δ	Complexity Δ
...eefair/gradle/plugins/lombok/LombokBasePlugin.java	76.92% <ø> (ø)	4.00 <0.00> (ø)
...reefair/gradle/plugins/lombok/LombokExtension.java	44.44% <0.00%> (-55.56%)	1.00 <0.00> (ø)
...dle/plugins/lombok/tasks/GenerateLombokConfig.java	0.00% <ø> (-69.57%)	0.00 <0.00> (-4.00)
...o/freefair/gradle/plugins/lombok/LombokPlugin.java	65.45% <75.75%> (+0.68%)	20.00 <12.00> (+5.00)
.../freefair/gradle/plugins/git/GitVersionPlugin.java	30.00% <0.00%> (+10.00%)	4.00% <0.00%> (ø%)

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