Simple indenting; Same thread highlighting

* Indenting for loaded items is displayed (not for live monitored items)
* ThreadId of each log item is included in the items list
* ThreadId of all items with the same SessionId and ThreadId as the selected item is highlighted
* Added build script that silently installs release setup
Show relative time of items based on selected item, with toolbar button
Indenting for live monitored items, with automatic updating of existing items
Improved file loading performance; Other minor changes

* Sometimes there were too few worker threads in the ThreadPool which resulted in 1-2 second idle delays while loading certain log file sets. See changes in App.xaml.cs for details.
* Fixed column jumping with relative time display
* Changed scope Enter/Leave visualisation in the items list