Update Protocol Message Parsing to Use a State Machine

[Swift2568]

Fixes #17

Risk

This PR makes no API changes.

Testing Plan

• [x] I have verified that I have not introduced new warnings in this PR (or explain why below)
• [ ] I have run the unit tests with this PR
• [x] I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).

Unit Tests

Core Tests

• Ubuntu Virtual machine, sdl_core 7.1.0, generic_hmi 0.12.0. Verified connection and feature communication with SmartDeviceLink-Example-Swift. Tested streaming with SDL Navigation MobilNav.
• Ubuntu Virtual machine, sdl_core 8.1.0, generic_hmi 0.12.0. Verified connection and feature communication with SmartDeviceLink-Example-Swift. Tested streaming with SDL Navigation MobilNav.
• TDK Sync 3.0. Verified connection and feature communication with SmartDeviceLink-Example-Swift.
• Manticore. Verified connection and feature communication with SmartDeviceLink-Example-Swift.
• Ubuntu Virtual machine, sdl_core 8.1.0, generic_hmi 0.12.0, encryption enabled. Tested encryption using EncryptionTestApp.

Core version / branch / commit hash / module tested against: sdl_core 8.1.0, sdl_core 7.1.0 HMI name / version / branch / commit hash / module tested against: generic_hmi 0.12.0

Summary

Converted SDLProtocol sdl_processMessages to use a state machine to process incoming message bytes.

Changelog

Enhancements

• Added SDLProtocolRecievedMessageProcessor.m and SDLProtocolRecievedMessageProcessor.h for the state machine.
• stateMachineManager manages the state machine.
• sdl_processMessagesStateMachine is the state machine for processing the bytes. It is loosely based on the java suite implementation, with significantly simplified logic.
• Changed sdl_processMessages to call stateMachineManager to process the bytes

CLA

• [x] I have signed the CLA

[codecov[bot]]

Codecov Report

Merging #2100 (1d50cc2) into develop (7324ff6) will increase coverage by 0.12%. The diff coverage is 95.40%.

@@             Coverage Diff             @@
##           develop    #2100      +/-   ##
===========================================
+ Coverage    85.33%   85.46%   +0.12%     
===========================================
  Files          447      448       +1     
  Lines        22646    22831     +185     
===========================================
+ Hits         19326    19512     +186     
+ Misses        3320     3319       -1