New revision (see comments)

[Sandroid75]

Hi Marcel, first of all I would like to thank you for the good work you did, for me it was an inspiration to improve few things, I hope you like them.

My notes:

• completely revised and improved functions
• now it can browse the directories with arrows (also scroll mouse)
• now most commands are associated with function keys
• better copy performance usign kernel function sendfile()
• confirmation is asked before overwriting existing files
• a formatted "rover.log" file is created with info and errors
• programming style is closer to GNU standards
• functions are divided into specific files
• Fixed several bugs
• also improved the handling of command line arguments
• VSCode folder with JSON files
• .clang-format file in order to keep a good style

ToDo:

• implement a modern progress bar