Encapsulate diff options into an object

[stringbean]

This should make things a bit easier for users.

Before:

XmlCompare.compare(left, right, Set(IgnoreChildOrder))

Becomes:

XmlCompare.compare(left, right, DiffOptions(IgnoreChildOrder))

// or if the default options also needed
XmlCompare.compare(left, right, DiffOptions.default & IgnoreChildOrder)

[codecov-io]

Codecov Report

Merging #5 into master will decrease coverage by 3.53%.
The diff coverage is 84%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage     100%   96.46%   -3.54%     
==========================================
  Files           7        8       +1     
  Lines         104      113       +9     
  Branches       13       13              
==========================================
+ Hits          104      109       +5     
- Misses          0        4       +4

Impacted Files	Coverage Δ
...tware/purpledragon/xml/scalatest/XmlMatchers.scala	100% <ø> (ø)	⬆️
...software/purpledragon/xml/specs2/XmlMatchers.scala	100% <100%> (ø)	⬆️
...software/purpledragon/xml/compare/XmlCompare.scala	100% <100%> (ø)	⬆️
...purpledragon/xml/compare/options/DiffOptions.scala	55.55% <55.55%> (ø)

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[codecov-commenter]

Codecov Report

Merging #5 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master        #5   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         8    +1     
  Lines          104       113    +9     
  Branches        13        13           
=========================================
+ Hits           104       113    +9     

Impacted Files	Coverage Δ
...tware/purpledragon/xml/scalatest/XmlMatchers.scala	100.00% <ø> (ø)
...software/purpledragon/xml/compare/XmlCompare.scala	100.00% <100.00%> (ø)
...purpledragon/xml/compare/options/DiffOptions.scala	100.00% <100.00%> (ø)
...software/purpledragon/xml/specs2/XmlMatchers.scala	100.00% <100.00%> (ø)

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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