Improved Line Ending Support

[complexlogic]

This PR makes the following changes:

• Automatically detect if a text file has CRLF or LF line endings. When writing changes to a file, preserve the file's existing line ending. Previously, the Manager would always use the default system line ending. This could result in changing the file's line ending type without user's permission
• Add a column in the song tree which indicates if the text file has CRLF or LF line endings
• Add a preparatory task which converts line endings according to user preference (see screenshot below)

[complexlogic]

@bohning OK if I push a new release?

[bohning]

Most definitely. Thanks for all the ifixes and mprovements!