Bugfixes, Tweaks
#FIX: EditorPlugins are now taken into consideration when determining dependency plugins upon CorePlugin reload. (fixes issue #56)
#CHANGE: Cleaned up some ReloadCorePluginDialog code.
#CHANGE: SoundInstances now use background threads for streaming.
#CHANGE: NightlyBuilder now opens the Unit Testing logfile instead of re-running all tests.
#CHANGE: Adjusted some tests to use proper specialized Asserts.