HELPER_getNewLogLines

Description: Gets the last (new) lines of a (growing) log file.
Parameter:

• log: Name of the log file.
• sessionPrefix: Prefix for storing the last read line number in the session.
• filterFunction: Function to filter the lines before adding them to the output. The function gets the unfiltered string as input and returns the filtedred version.

Returns:

• UTF8-encoded new lines of the log file.