Fix grammatical issues and add some convenient getters

[pepicrft]

Resolves #286

This PR aims to fix some grammatical issues in the name of some attributes and add some convenient methods to get the objects directly.

Implementation 👩‍💻👨‍💻

• Fix grammatical issues
• Add convenient getters for the reported attributes.
• Revisit the following models and add object getters, deprecation annotations, and constructors that initialize the object passing objects instead of references:
  • Project models
  • Configuration models
  • File/Group models
  • Target models
  • Build models

[ghost]

Danger run resulted in 2 messages and 2 warnings; to find out more, see the checks page.

Generated by 🚫 dangerJS

[codecov]

Codecov Report

Merging #291 into master will decrease coverage by 0.11%.
The diff coverage is 71.92%.

@@            Coverage Diff             @@
##           master     #291      +/-   ##
==========================================
- Coverage   75.72%   75.61%   -0.12%     
==========================================
  Files         116      116              
  Lines        5261     5269       +8     
==========================================
  Hits         3984     3984              
- Misses       1277     1285       +8

Impacted Files	Coverage Δ
...odeprojTests/Objects/XCConfigurationListSpec.swift	100% <100%> (ø)	⬆️
Sources/xcodeproj/Objects/PBXLegacyTarget.swift	31.7% <100%> (ø)	⬆️
...ources/xcodeproj/Objects/XCConfigurationList.swift	95.31% <100%> (ø)	⬆️
...s/xcodeprojTests/Objects/PBXNativeTargetSpec.swift	100% <100%> (ø)	⬆️
Sources/xcodeproj/Objects/PBXNativeTarget.swift	92.1% <100%> (ø)	⬆️
Tests/xcodeprojTests/Objects/PBXProjectSpec.swift	100% <100%> (ø)	⬆️
Sources/xcodeproj/Utils/ReferenceGenerator.swift	96.96% <100%> (ø)	⬆️
...ources/xcodeproj/Sourcery/Equality.generated.swift	93.9% <100%> (ø)	⬆️
Sources/xcodeproj/Objects/PBXTarget.swift	38.37% <33.33%> (-2.88%)	⬇️
Sources/xcodeproj/Objects/PBXProject.swift	78.64% <66.66%> (-1.56%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f7f497b...046a44c. Read the comment docs.