Interface Builder support (iOS & tvOS only)

[dzenbot]

Based on the initial work from https://github.com/dzenbot/Iconic/pull/41 Closes https://github.com/dzenbot/Iconic/issues/67

Iconic includes a UIImageView subclass under the name of {FontName}IconView.swift, conforming to @IBInspectable. This class is only available for Interface Builder.

• Use the iconName attribute for see live changes on Interface Builder.
• The icon color is automatically set with the tintoColor of the view.
• Adjust the bounds of the view to see it dynamically adapt the icon's size.

[codecov-io]

Codecov Report

Merging #66 into master will increase coverage by 5.84%. The diff coverage is 82.72%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   61.84%   67.68%   +5.84%     
==========================================
  Files          14       14              
  Lines         697      727      +30     
  Branches        1        1              
==========================================
+ Hits          431      492      +61     
+ Misses        266      235      -31

Impacted Files	Coverage Δ
Samples/iOS/Classes/FirstViewController.swift	0% <ø> (ø)	:white_check_mark:
Samples/iOS/Classes/AppDelegate.swift	0% <ø> (ø)	:white_check_mark:
Samples/Tests/ObjcCompatibilityTests.m	100% <ø> (ø)	:white_check_mark:
Source/IconDrawable.swift	91.18% <ø> (ø)	:white_check_mark:
...mples/Tests/Tools/NSAttributedString+IconMapping.m	100% <ø> (ø)	:white_check_mark:
Samples/Tests/IconDrawableTests.swift	89.62% <ø> (ø)	:white_check_mark:
Samples/iOS/Classes/ThirdViewController.m	0% <ø> (ø)	:white_check_mark:
Samples/iOS/Classes/SecondViewController.swift	0% <ø> (ø)	:white_check_mark:
Samples/Tests/IconImageViewSnapshotTests.swift	100% <100%> (ø)
Samples/Tests/ImageIconSnapshotTests.swift	100% <100%> (ø)	:white_check_mark:
... and 4 more

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