Add new property CachedUntil to CachedLayoutRendererWrapper

[snakefoot]

If wanting to refresh the cached-value every 1 minutes. Then one can do this:

${local-ip:cachedSeconds=60}

But if wanting to refresh the cached-value every day (or every hour), then things get more blurry, as it will only work when application startup exactly at midnight.

Instead it should also be possible to do this:

${local-ip:cachedUntil=HourChange}

And it will reset the cached value exactly when the hour-changes. See also: JDetmar/NLog.Extensions.AzureStorage#93

[304NotModified]

Maybe rename it to cacheResetOn?

[snakefoot]

I like to keep them similar: "Cached", "CachedSeconds", "CachedDuration".

[snakefoot]

Maybe merge CachedDuration together with ClearCache

[304NotModified]

Duration sounds the same as seconds. I expect with cacheDuration=hour == cacheSeconds=3600

[snakefoot]

CachedUntil ?

[304NotModified]

Sounds good!