Add ppsspp psp emulator

apps/PPSSPP (PSP emulator)/credits

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+Added to pi-apps by @chunky-milk

apps/PPSSPP (PSP emulator)/description

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+A PSP emulator that can run PSP games in full HD and can upscale textures also.
+
+How to run: Menu > Games > PPSSPP

apps/PPSSPP (PSP emulator)/install-32

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+#!/bin/bash
+
+DIRECTORY="$(dirname "$(dirname "$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )")")"
+
+function error {
+  echo -e "\\e[91m$1\\e[39m"
+  exit 1
+}
+
+# Get dependencies
+"${DIRECTORY}/pkg-install" "build-essential cmake libgl1-mesa-dev libsdl2-dev libvulkan-dev wget unzip apt-transport-https" "$(dirname "$0")" || exit 1
+cd ~/
+rm -f ppsspp_1.11.2_armhf.zip
+wget https://github.com/chunky-milk/ppsspp-rpi/releases/download/1.11.2/ppsspp_1.11.2_armhf.zip || error "Failed to download zip!"
+unzip ppsspp_1.11.2_armhf.zip || error "Failed to unzip PPSSPP!"
+rm ppsspp_1.11.2_armhf.zip || error "Failed to remove zip!"
+
+# Desktop entry
+echo "[Desktop Entry]
+Version=1.0
+Type=Application
+Name=PPSSPP
+Comment=PSP emulator
+Icon=$(dirname "$0")/icon-64.png
+Exec=$HOME/ppsspp/PPSSPPSDL
+Categories=Game;" > ~/.local/share/applications/ppsspp.desktop || error "Failed to create desktop entry!"
+

apps/PPSSPP (PSP emulator)/uninstall

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+#!/bin/bash
+
+DIRECTORY="$(dirname "$(dirname "$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )")")"
+
+function error {
+  echo -e "\\e[91m$1\\e[39m"
+  exit 1
+}
+
+#if your app installs any packages, keep this command here so those packages will be removed.
+"${DIRECTORY}/purge-installed" "$(dirname "$0")" || exit 1
+
+rm ~/.local/share/applications/ppsspp.desktop || error "Failed to remove desktop entry!"
+
+rm -rf ~/ppsspp || error "Failed to remove install directory!"

apps/PPSSPP (PSP emulator)/website

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+http://ppsspp.org