Tweak display of logs time
rename LogEvent property to loglevel from logLevel
Fix configuration allowing multiple writer plugins
Fix some type checks, update event map structure from plugins
Update use of loglevel property of LogEvent
Fix potential npe if event data has null message
Simulate tail mode in browser if necessary
de-emphasize non other level log output
Update time display in output
Fix potential NPE if metadata is null
Filter log events for executions by level threshold