Implement Mobile device model

[damien-rivet]

Implements #5.

[codecov]

Codecov Report

Merging #43 into develop will increase coverage by 0.81%.
The diff coverage is 99.15%.

@@             Coverage Diff             @@
##           develop      #43      +/-   ##
===========================================
+ Coverage    97.96%   98.77%   +0.81%     
===========================================
  Files           16       24       +8     
  Lines          393     1063     +670     
===========================================
+ Hits           385     1050     +665     
- Misses           8       13       +5

Impacted Files	Coverage Δ
JAMFKit/Sources/Models/NetbootServer.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/Department.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/SMTPServer.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/PreciseDate.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/User.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/NetworkSegment.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/Printer.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/BaseObject.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/Site.swift	100% <ø> (ø)	⬆️
JAMFKit/Sources/Models/Building.swift	100% <ø> (ø)	⬆️
... and 24 more

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