Add aliases for BSI commands

[mountaindude]

Add aliases to all thumbnail/sheet icon manipulating commands, e.g.

butler-sheet-icons qseow create-sheet-thumbnails
butler-sheet-icons qseow create-sheet-icons

and

butler-sheet-icons qseow remove-sheet-thumbnails
butler-sheet-icons qseow remove-sheet-icons

and

butler-sheet-icons qscloud create-sheet-thumbnails
butler-sheet-icons qscloud create-sheet-icons

and

butler-sheet-icons qscloud remove-sheet-thumbnails
butler-sheet-icons qscloud remove-sheet-icons

[mountaindude]

Released as part of version 3.5.0.