add retropie app

apps/Retropie/description

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+Play your favourite retro games.
+Be sure to mention HOW TO RUN this app, both from the menu and from a terminal.
+ ∙ Emulates games from 50+ consoles
+ ∙ Kodi support
+ ∙ Skinable
+ ∙ AND MUCH MORE!
+Instructions for installing ROMs are on the webiste
+After install, please select "Basic Install" Then select "Yes"

apps/Retropie/install

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+#!/bin/bash
+
+DIRECTORY="$(dirname "$(dirname "$(dirname "$0")")")"
+function error {
+  echo -e "\e[31m$1\e[39m"
+  exit 1
+}
+
+# Get dependencies
+"${DIRECTORY}/pkg-install" "abuse-lib abuse-sfx alsa-oss alsa-utils autoconf automake autotools-dev binfmt-support bison bluetooth bluez-tools build-essential ca-certificates check checkinstall cmake curl debhelper devscripts dh-autoreconf dh-systemd dialog dirmngr distcc dkms dos2unix dosfstools doxygen e2fsprogs exfat-fuse fbi fcitx-libs-dev feh flac flex fluid-soundfont-gm fontconfig fonts-freefont-ttf fonts-takao fonts-takao-gothic freepats g++ gawk gcc gcc-6 git golang graphviz gstreamer1.0-alsa gstreamer1.0-libav gstreamer1.0-plugins-good icu-devtools imagemagick insserv joystick jq kpartx lhasa libaldmb1-dev liballegro4-dev libao-dev libarchive-dev libasound2-dev libaudiofile-dev libavcodec-dev libavcodec-devlibavformat-dev libavfilter-dev libavformat-dev libavresample-devlibfontconfig1-dev libavutil-dev libbluetooth3 libbluetooth-dev libboost-all-dev libboost-dev libboost-filesystem-dev libboost-regex-dev libboost-system-dev libboost-thread-dev libbz2-dev libcaca-dev libcap-ng-dev libcurl4-openssl-dev libdbus-1-dev libdbus-glib-1-dev libdirectfb-dev libdrm-dev libdw-dev libegl1-mesa-dev libenet-dev libev-dev libevdev-dev libevdev-devlibexpat1-dev libevdev-tools libfaad-dev libflac++-dev libflac-dev libfluidsynth-dev libfontconfig1-dev libfreeimage-dev libfreetype6-dev libfreetype6-devlibcurl4-openssl-dev libfreetype6-devlibudev-dev libfreetype6-devzlib1g-dev libgbm-dev libgl1-mesa-dev libgles2-mesa-dev libglew-dev libglm-devlibluajit-5.1-dev libglu1-mesa-dev libgme-dev libguichan-dev libibus-1.0-dev libical-dev libicu-dev libinput10 libjpeg-dev libjpeg-devcmake libjpeg-devlibtiff5-dev liblua5.1-0-dev libluajit-5.1-dev liblzo2-dev libmad0-dev libmad0-devlibpng-dev libmbedtls-dev libmikmod-dev libminiupnpc-dev libmng-dev libmodplug-dev libmpeg2-4-dev libmpg123-dev libogg-dev libogg-devlibmodplug-dev libopenal-dev libopus-dev libpango1.0-devlibsndfile1-dev libpcap-dev libpciaccess-dev libphysfs-dev libpng-dev libpng-devlibtheora-dev libpthread-stubs0-dev libpulse-dev libraspberrypi-dev libraspberrypi-doc libreadline-dev librsvg2-bin libsamplerate0-dev libsdl1.2-dev libsdl2-dev libsdl2-image-dev libsdl2-mixer-dev libsdl2-net-dev libsdl2-ttf-dev libsdl2-ttf-devlibopenal-dev libsdl2-ttf-devlibsdl2-image-dev libsdl-gfx1.2-dev libsdl-image1.2-dev libsdl-mixer1.2-dev libsdl-ttf2.0-dev libsfml-dev libsm-devlibvlc-dev libsnappy-dev libsndfile1-dev libsndio-dev libsoil-dev libsoundtouch-dev libspectrum-dev libspeexdsp-dev libsqlite3-dev libssl-dev libsubunit-dev libswscale-dev libtheora-dev libtinfo-dev libtolua++5.1-dev libtool libudev-dev libudev-devlibavahi-client-dev libuim-dev libusb-1.0-0-dev libusb-dev libvlccore-dev libvlc-dev libvorbis-dev libvorbisidec-dev libvpx-dev libvulkan-dev libwebp-dev libx11-dev libxext-dev libxi-dev libxinerama-dev libxkbcommon-dev libxkbcommon-x11-0 libxml2-dev libxrandr-dev libxt-dev libxv-dev libyaml-dev libzip-dev libzzip-dev LINUX-HEADERS lsb-release lynx-cur matchbox-window-manager mc meson ninja-build nodejs npm ntfs-3g omxplayer oss-compat p7zip-full pandoc parted patchelf pkg-config pkg-configlibsdl2-dev policykit-1 portaudio19-dev pulseaudio-utils python2-dev python3 python3-dev python3-pip python3-pyudev python3-setuptools python-dbus python-dev python-gobject python-numpy python-pygame python-pyrex qt5-default qtbase5-private-dev raspberrypi-kernel-headers rename rsync samba scons sqlite3 squashfs-tools subversion tcl-dev texinfo timidity unzip uuid-dev virtualenv vlc wget x11proto-core-dev xa65 xmlstarlet xorg zenity zlib1g zlib1g-dev zlib1g-devlibjpeg-dev" "$(dirname "$0")" || exit 1
+
+#Clone setup script
+cd
+git clone --depth=1 https://github.com/RetroPie/RetroPie-Setup.git
+
+#Run setup
+cd RetroPie-Setup
+chmod +x retropie_setup.sh
+sudo ./retropie_setup.sh
+
+#Delete setup script
+sudo rm -r ~/RetroPie-Setup

apps/Retropie/uninstall

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+#!/bin/bash
+
+DIRECTORY="$(dirname "$(dirname "$(dirname "$0")")")"
+function error {
+  echo -e "\e[31m$1\e[39m"
+  exit 1
+}
+
+#Reruns the script for uninstall
+cd
+git clone --depth=1 https://github.com/RetroPie/RetroPie-Setup.git
+cd RetroPie-Setup
+chmod +x retropie_setup.sh
+
+#Prompts for input
+echo 'In the following menu, please press "Uninstall Retropie". NOTE: Make sure to keep the packages that were there before the retropie install.'
+read -p 'Press [Enter] to open the retropie menu.'
+sudo ./retropie_setup.sh
+
+#if your app installs any packages, keep this command here so those packages will be removed.
+"${DIRECTORY}/purge-installed" "$(dirname "$0")" || exit 1

apps/Retropie/website

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+https://retropie.org.uk/