Install script improvements2 (#907)
Install script improvements2 (#907)

* Extract apt-get commands, use -qq to make installation less noisy

plus add timing to script

* Improve functions in install script

wifi_settings, existing_assets, folder_access & finish_installation

* Simplify user input in install script

* Use ${jukebox_dir} in main_install function in install script
MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID