Improve ToolBox PtsToTimeString
Prefer StartsWith(char)
Add StringBuilder StartsWith(char)
Reduce StringBuilder Append allocations
Prefer EndsWith(char)
Add StringBuilder EndsWith(char)
Remove redundant ToCharArray
Prefer Contains(char)
Merge pull request #249 from alfaproject/pts_to_time

Improve ToolBox PtsToTimeString - Nice :)
Merge pull request #250 from alfaproject/string_performance

Improve general string performance
Dutch translation (nl-NL) corrected and updated