Log viewer Improvements

There are some annoying issues that could be improved in the log viewer in Studio Go:

• If the log viewer is open, and a new log message is appended, the list scrolls back to the top. Even if I'm looking at older messages
• After running the application for a while, the log viewer becomes very slow
• When selecting the Debug log level when the current log level is not set to Debug yet, there's a message telling me to change the log level. Please give me an option to change that setting directly from that message, e.g. Do you want to change the setting now [yes] [no]

And specific for development with the Mobile SDK:

• Sometimes when pressing F12 to open the log viewer while running from Visual Studio, the application closes itself. This doesn't happen all the time, and in fact, I can't reproduce it right now :-)
• The selected log level is always reset to Info when closing the application. This makes it harder to debug issues that occur at startup