JavaConsole causes MemoryLeak and should maybe disabled by default

[AlBundy33]

This is a follow up for #893 because the MemoryLeak in JavaConsole was not fixed in this issue.

The problem is, that the console holds a list with all outputs and is by default only hidden and not disabled.
Therefore the mentioned list grows and grows until an OutOfMemoryException occurs.

A possible fix for this issue would be to set the console by default to disabled.
btw.: what is the purpose of the hidden console? is there some kind of shortcut to make it visibile during runtime?

a better fix would to limit the size of the list so that the OutOfMemory can not happen.
or use a file instead of a list.
or some other fix that avoids the out of memory. :-)

this was also reported in karakun/OpenWebStart#530