Case-sensitivity of refreshCache

[singularcitrus]

I discovered an interesting bug that confused me for about a day.

When you call the "render" endpoint on a rendertron instance that uses memory cache you can either use refreshCache=true or refreshcache=true. But when calling it on an instance that uses filesystem caching only refreshCache=true works.

I know that refreshCache=true is the correct way but this is a bit inconsistent that may lead to other users getting confused about why it works properly in one instance and not another.