retroflag-picase for OSMC

A modification of RetroFlag safe shutdown installatation script from crcerror adapted for OSMC (usr of /boot/config-user.txt instead of /boot/config.txt).

Section 1
Installers for NesPi+, MegaPi, SuperPi cases and (since 2020/08/22) NESPI4 Support for OSMC

Section 2
Uninstall for all systems and all cases
This means uninstaller for NesPi+, MegaPi, SuperPi and GPi cases
for RetroPie, RecalBox and BATOCERA

Section 1. RetroFlag Pi-Case+ Safe Shutdown for OSMC

Turn switch "SAFE SHUTDOWN" on PCB to ON position.

Turn switch "SAFE SHUTDOWN" on PCB to ON.

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Install for OSMC:

1. Make sure internet connected.
2. Connect through SSH
3. In the terminal, type the one-line command below (case sensitive):

wget -O - "https://raw.githubusercontent.com/Steuv1871/retroflag-picase-osmc/master/install.sh" | sudo bash

Section 2. Uninstallers

Example for OSMC

Type in the terminal, type the one-line command below (case sensitive):

wget -O - "https://raw.githubusercontent.com/Steuv1871/retroflag-picase-osmc/master/uninstall_all.sh" | sudo bash