Migrate to Swift 4.2

[huri000]

Issue Link 🔗

Swift 4.2 Support #108

Goals 🥅

Migrate to Swift 4.2 Wholy including CocoaPods, Carthage, Example project (test), Quick Layout new version.

[codecov]

Codecov Report

Merging #115 into master will increase coverage by 0.02%.
The diff coverage is 22.72%.

@@            Coverage Diff            @@
##           master    #115      +/-   ##
=========================================
+ Coverage    4.18%   4.21%   +0.02%     
=========================================
  Files          56      56              
  Lines        2102    1969     -133     
=========================================
- Hits           88      83       -5     
+ Misses       2014    1886     -128

Impacted Files	Coverage Δ
...EntryAttributes/EKAttributes+BackgroundStyle.swift	0% <ø> (ø)	⬆️
Source/Infra/EKRootViewController.swift	0% <0%> (ø)	⬆️
Source/Infra/EKContentView.swift	0% <0%> (ø)	⬆️
...ssageViews/Notes/EKProcessingNoteMessageView.swift	0% <0%> (ø)	⬆️
Source/Model/EKProperty.swift	0% <0%> (ø)	⬆️
...e/MessageViews/MessagesUtils/EKButtonBarView.swift	0% <0%> (ø)	⬆️
.../EntryAttributes/EKAttributes+HapticFeedback.swift	0% <0%> (ø)	⬆️
...del/EntryAttributes/EKAttributes+Validations.swift	90% <100%> (ø)	⬆️
...del/EntryAttributes/EKAttributes+WindowLevel.swift	100% <100%> (ø)	⬆️
...odel/EntryAttributes/EKAttributes+Precedence.swift	53.12% <0%> (-4.77%)	⬇️
... and 10 more

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