Delphi - added .dsk and .bpi and comments

Change the grouping of the file with # comments to clearly identify areas like other languages have done.

Added
.dsk  - IDE/Project Settings - Specific to each developer.    Has no bearing on the resulting compiler output.
.bpi  - Produced during compile when targeting OS X.

Current file extensions for Delphi are documented here:
http://docwiki.embarcadero.com/RADStudio/XE5/en/File_Extensions_of_Files_Generated_by_RAD_Studio

Another source, that covers older versions of Delphi.
http://delphi.wikia.com/wiki/Delphi_File_Extensions