Added more escape code support for config file. Added option Regex replace parameter which enables replacement by group name from Regex pattern + additional tests.
Fixed issue causing failure of ThreadAgnosticAttributeTest.
Fix bug in ReplaceNamedGroup + added tests.
More testing
Fixed wrong call site when NLog is called via Common.Logging.
Merge pull request #357 from DannyVarod/master

Extended ReplaceLayoutRendererWrapper and LayoutParser to support more advanced Regex replacements and more escape codes