🔢 Enhancements

[artemnovichkov]

There are some useful changes in this request. I decided to combine it into one PR to reduce code review hell :)
Here is a checklist for the changes:

• Array extension for texts joining. Supports custom separator
• Custom + operator for texts and strings
• Add missing attributes: ligature, shadow, strokeColor
• Add string concatenation for text

[codecov-io]

Codecov Report

Merging #8 into master will increase coverage by 0.9%.
The diff coverage is 99.39%.

@@            Coverage Diff            @@
##           master       #8     +/-   ##
=========================================
+ Coverage   98.79%   99.69%   +0.9%     
=========================================
  Files          16       22      +6     
  Lines         662      979    +317     
=========================================
+ Hits          654      976    +322     
+ Misses          8        3      -5

Impacted Files	Coverage Δ
Texstyle/Texstyle/Text.swift	100% <ø> (ø)	⬆️
Texstyle/Texstyle/StringInterpolation+Text.swift	100% <100%> (ø)
Texstyle/Texstyle/TextStyle.swift	100% <100%> (ø)	⬆️
Texstyle/TexstyleTests/ShadowStyleTests.swift	100% <100%> (ø)
Texstyle/TexstyleTests/ShadowStyle+Random.swift	100% <100%> (ø)
Texstyle/TexstyleTests/TextTests.swift	99.78% <100%> (+2.77%)	⬆️
Texstyle/TexstyleTests/TextStyle+Random.swift	100% <100%> (ø)	⬆️
Texstyle/TexstyleTests/StringTests.swift	100% <100%> (ø)	⬆️
Texstyle/Texstyle/ShadowStyle.swift	100% <100%> (ø)
Texstyle/TexstyleTests/TextStyleTests.swift	100% <100%> (ø)	⬆️
... and 9 more

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