Make baseline entities internal

[arturbosch]

Needs #2739 to merge first.

[codecov]

Codecov Report

Merging #2740 into master will not change coverage.
The diff coverage is 90.00%.

@@            Coverage Diff            @@
##             master    #2740   +/-   ##
=========================================
  Coverage     80.50%   80.50%           
+ Complexity     2310     2309    -1     
=========================================
  Files           378      377    -1     
  Lines          6962     6962           
  Branches       1262     1262           
=========================================
  Hits           5605     5605           
  Misses          728      728           
  Partials        629      629           

Impacted Files	Coverage Δ	Complexity Δ
...b/arturbosch/detekt/cli/baseline/BaselineFormat.kt	83.33% <75.00%> (+0.72%)	4.00 <1.00> (ø)
.../gitlab/arturbosch/detekt/cli/baseline/Baseline.kt	66.66% <100.00%> (ø)	4.00 <1.00> (ø)
...osch/detekt/cli/baseline/BaselineFilteredResult.kt	100.00% <100.00%> (ø)	3.00 <2.00> (ø)
...h/detekt/cli/baseline/DelegatingXMLStreamWriter.kt	100.00% <100.00%> (ø)	1.00 <1.00> (ø)
...ch/detekt/cli/baseline/IndentingXMLStreamWriter.kt	60.37% <100.00%> (ø)	15.00 <1.00> (ø)
...ab/arturbosch/detekt/cli/baseline/XmlExtensions.kt	23.52% <100.00%> (ø)	0.00 <0.00> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update afebefc...87b4ae8. Read the comment docs.