Various fixes and improvements

[josesimoes]

Description

• Add missing Equals and GetHashCode on several classes.
• Rework GetHostEntry to properly parse data from native call.
• Apply back fix from Fix IPAddress byte constructor #217
• Fix several comments for documentation.
• Several fixes in code style.
• Improvements from analysers.

Motivation and Context

• Resolves Native getaddrinfo assumptions should be re-evaluated Home#928.
• Fixes GetHashCode failing for IPAddress Home#929.

How Has This Been Tested?

• Running Unit Tests locally on device.

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Unit Tests (work on Unit Tests, has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[josesimoes]

Unit Tests will fail because WIN32 nanoCRL it's missing the System.Net declaration updated.