Add Proxy Support for Reddit Requests

[maxisoft]

This pull request implements proxy support for Reddit requests within the ASFFreeGames plugin, addressing issues #75 and #76.
Users can now leverage proxies Reddit.com api specific connections, increasing flexibility for those utilizing proxy servers for Reddit interactions.

Changes:

• New configuration options:

  • ASFFreeGamesOptions.cs: Added properties Proxy and RedditProxy to support proxy configuration for general and Reddit connections, respectively.
  • ASFFreeGamesOptionsLoader.cs: Updated to load proxy settings from configuration and environment variables. These settings are then merged to ensure all configurations are considered.

• Refactored Reddit communication:

  • FreeGamesCommand.cs: Modified GetGames to utilize SimpleHttpClientFactory and its CreateForReddit method, enabling the use of the configured Reddit proxy.
  • RedditHelper.cs: Replaced WebBrowser usage with SimpleHttpClient for Reddit communication, allowing proxy support.

Benefits:

• Increased flexibility for users who require proxy servers for Reddit interactions.
• Improved code maintainability by utilizing SimpleHttpClient consistently.

Disclaimers/Bugs/Issues:

• Potential Security Concern: Merging environment variables and configuration file settings for proxy information could lead to sensitive data (like proxy passwords) being unintentionally written to the JSON file. Consider implementing a mechanism to exclude sensitive data from being saved to the configuration file.
• Potential for Future System.MissingMethodException: This change might introduce the possibility of encountering System.MissingMethodException errors in future ASF updates. Thorough testing and potential code updates may be required to mitigate this risk.

Testing:

• Manual testing with various proxy configurations is recommended to ensure proper functionality.

Additional Notes:

• Consider adding a note about potential limitations or specific proxy requirements (if applicable).

TO-DOs:

• Update README to reflect the new proxy support functionality.
• Create new issues for the identified security concern.
• Conduct more comprehensive testing to ensure stability across various configurations.