Show Diff line endings

[SpacePossum]

This PR:

• fixes diff. line endings detection; for example \r\n vs. \r is currently not picked up
• fixed diff. line endings detection when providing two arrays to diffToArray, currently detection is only done when two strings are provided
• differ appends the line break to the diff entries so the output can handle those

The last one is the most important one, not only for the output. Sample code;

    $diff = new \SebastianBergmann\Diff\Differ();
    $diff = $diff->diff(
        "<?php\n",
        "<?php\r"
    );

Output on 1.4

--- Original
+++ New
@@ @@
 #Warning: Strings contain different line endings!
 <?php

Output proposed in PR;

--- Original
+++ New
@@ @@
 #Warning: Strings contain different line endings!
-<?php
"<?php

(note the location of the last " because of the \r being outputted as well) Having both a ADDED and REMOVED line is essential for creating valid diff, but already for readability in some other cases.

[keradus]

aaaah, almost started reviewing :D

[codecov-io]

Codecov Report

Merging #63 into master will increase coverage by 0.02%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #63      +/-   ##
============================================
+ Coverage     99.68%   99.71%   +0.02%     
- Complexity      121      138      +17     
============================================
  Files            10       10              
  Lines           315      347      +32     
============================================
+ Hits            314      346      +32     
  Misses            1        1

Impacted Files	Coverage Δ	Complexity Δ
src/Differ.php	99.09% <100%> (+0.21%)	48 <16> (+12)	:arrow_up:
src/Output/UnifiedDiffOutputBuilder.php	100% <100%> (ø)	18 <0> (+3)	:arrow_up:
src/Output/DiffOnlyOutputBuilder.php	100% <100%> (ø)	10 <0> (+2)	:arrow_up:

---

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