Adds aliases for exa. Also change default blue colors to blue bold (file's date, modified flag in Git).

• ls lists directories first (applies to all aliases below).
• ll lists with long format and git status (applies to all aliases below).
• l lists all files and ignore the .git directory (applies to all aliases below).
• la lists files with icons and type indicators
• lg lists files with respect to .gitignore
• lr lists recursively as a tree.
• lx lists sorted by extension.
• lk lists sorted by largest file size last.
• lt lists sorted by newest modification time last.
• lc lists sorted by newest status change (ctime) last.

This module must be sourced after the utility module, so this module can override the aliases set by that one.