Fixes cnext injection on inherited properties.

Created by: roridev

Summary

Allow CommandsNextUtilities.CreateInstance to inject into inherited properties.

Details

Currently cnext doesn't properly handle injection into inherited properties.
This PR fixes it by changing TypeInfo.DeclaredProperties / TypeInfo.DeclaredFields to Type.GetRuntimeProperties / Type.GetRuntimeFields since Type.GetRuntime* correctly handle inheritance, while TypeInfo.Declared* doesn't.

Changes proposed

As it currently stands the following field when accessed by a command through its superclass will result on a null value.

public abstract class CustomCommandModule : BaseCommandModule {
    public BotConfig Config;
    // Config gets injected and its usable here, but due to the use case its not what you'd want.
}

public class ACommand : CustomCommandModule {
// Here Config is null, because BotConfig Config is inherited rather than declared here.
// With this fix, `Config` becomes usable here.
}

This can be used, for example, passing local custom data to many groups without code duplication.

Notes