Added option to toggle Show Latest On Top

[JiboStore]

Please merge this push request. It enables Show Latest Log on top, as it may be difficult to keep scrolling through to the bottom to show the latest log

[Kalmalyzer]

Thanks for implementing this. However, wouldn't it make more sense to have a "Follow" option? Just like the in-editor console windows? (both the regular Console window and the UberConsole window have this)

[I also notice that the DrawLogListDescending() and DrawLogListAscending() implementations contain a whole lot of duplicated code. If this PR was to be merged - which I'm not sure about, I think a "Follow" option would be better for UberLogger long term - then it should first be rewritten to eliminate the code duplication.]

[bbbscarter]

First of all - thanks for this! This is a useful feature.

However, I think I agree; ideally it would be handled the same way as the editor window, unless there's a compelling reason not to?