Improve user experience

• Create logger functions (info, warn, error)
• Create prompt function that loops for user input and handles errors
• Create prompt_pwd function that hides password and checks mismatch
• Add a loop while waiting sudo password
• Handle any special characters in user inputs

This merge request is also merging changes from !1 (merged) and !3 (closed)

Fixes #3 (closed) and #4 (closed)