Add case insensitive sorting of applications

[nabakolu]

This patch adds the -c, --case-insensitive option, which makes the alphabetical sorting of the applications be done by a utility function that sorts them case insensitively.

[enkore]

Thank you, I have two suggestions

• I think using strncasecmp portably requires including <strings.h>, these being defined by string.h (without -s) seems to be a glibcism
• -i might be a more conventional choice for case insensitivity (e.g. grep)

[nabakolu]

Yes strncasecmp is defined in strings.h.
I included <strings.h> and changed the -c to -i

Also merged the updated develop branch

[enkore]

Thanks!