Improved Lex format (new features and better ux)

User can specify begin and end of a segment separately using
"BeginSegment" and "EndSegment" methods.
Updated gplex.exe to the version 1.2.1
Added ability to specify culture when parsing timestamp
Added debug output for the whole segment as a string
Minor bug fixes
Updated UI + bug fixes

Updated ModernUI to version 1.0.5
Improved UX
Fixed failing test
Updated packages
Fixed the issue with jumping to a next record using stats