Improve diff output format in TestComparator

[petertrr]

What's done:

• Added format for ChangeDeltas

This pull request closes #143

Example of the new format:

[ERROR] 2020-12-25 17:43:18 Expected result from <Example1Expected.kt> and actual formatted are different.
See difference below (for ChangeDelta [text] indicates removed text, <text> - inserted):
[DeleteDelta, position: 3, lines: [    /** Docs */]]
[InsertDelta, position: 18, lines: [     * @param sub]]
[ChangeDelta, position 19, lines: [     */
 <   >fun String.countSubStringOccurrences(sub: String): Int {]]
[ChangeDelta, position 30, lines: [         <   >this.replace("\\", "/").replace("//", "/")]]
[ChangeDelta, position 39, lines: [           < >y: [  ]Int) = x +]]

[orchestr7]

It looks more complex for me and less readable :)

[codecov]

Codecov Report

Merging #668 (4672c0b) into master (9e8d7c1) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #668   +/-   ##
=========================================
  Coverage     79.24%   79.24%           
  Complexity     1803     1803           
=========================================
  Files            87       87           
  Lines          4708     4708           
  Branches       1513     1513           
=========================================
  Hits           3731     3731           
  Misses          280      280           
  Partials        697      697           

Flag	Coverage Δ	Complexity Δ
unittests	79.24% <ø> (ø)	0.00 <ø> (ø)

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[orchestr7]

lgtm