Add support for Battlefield 1942, Vietnam and 2142

[cetteup]

Added support for reading name only for Battlefield 1942 and Vietnam, since these don't support clan tags/prefixes. Battlefield 2142 gets supported with name + prefix, since it is almost identical to Battlefield 2.

Changes

• Add reader class and interface, player class for Battlefield 1942, Vietnam and 2142
• Move common Refractor engine code out of BF2 code
• Introduce common code for Refractor 1 engine games (1942, Vietnam) and Refractor 2 engine games (2, 2142)
• Update documentation accordingly

Let me know if there's anything about the new structure that needs to be changes (I am mostly clueless with C# after all).

[TwitchPlaysBF2]

Thanks for the big contribution! Very nice refactorings/base extractions. The structure is good! Top notch integration.

I'm committing some minor cleanups after merging the PR, which are mainly just taste preferences.

• Split class members into separate declarations - this is really a personal preference thing but all of the companies I've ever worked for were enforcing this rule for reasons of:
  • Point blank readability (<-- important for making bug-hunting easier)
  • Easier to detect refactoring needs
  • Easier to refactor
  • Won't make lines long
  • Won't cause as many merge-conflicts when working with others
  • Will leave Git Diffs less messy and more readable, upon changes
• Extended the service class registrations in ServiceCollectionExtensions.cs so that DI based environments could also inject the new services (and mock them in tests)
• Refactor GameName class member to config base class since it's used in every config

Thank you! 🚀