This commit introduces proxy support for Reddit requests within the ASFFreeGames plugin, addressing issues #75 #76.

Users can now configure proxies for both general and Reddit-specific connections through the Proxy and RedditProxy settings in ASFFreeGamesOptions.cs.

Key changes:

- 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.
- 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.

These improvements enhance the plugin's flexibility by allowing users to leverage proxy servers for Reddit interactions.

…limiting from Reddit.

* Added checks for remaining rate limit and reset time to implement appropriate delays based on Reddit's response headers.

GetStreamAsync() internal request object use configured http version