Add Ulauncher app

apps/Ulauncher/credits

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+RPiCoder on Discord recommended this.
+Botapot made the scripts.

apps/Ulauncher/description

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+All-in-one application launcher, Google search engine, calculator, file manager...
+This is the best app launcher I've ever seen, though it can be a bit slow when searching. - Botspot

apps/Ulauncher/install

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+#!/bin/bash
+
+DIRECTORY="$(dirname "$(dirname "$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )")")"
+
+function error {
+  echo -e "\\e[91m$1\\e[39m"
+  exit 1
+}
+
+"${DIRECTORY}/pkg-install" "gir1.2-appindicator3-0.1 python3-distutils-extra python3-levenshtein python3-websocket" "$(dirname "$0")" || exit 1
+
+wget 'https://github.com/Ulauncher/Ulauncher/releases/download/5.9.0/ulauncher_5.9.0_all.deb' -O ~/ulauncher.deb || error 'Failed to download ulauncher.deb!'
+
+sudo apt install -y --fix-missing ~/ulauncher.deb || error "APT failed to install ulauncher.deb!"
+
+rm -f ~/ulauncher.deb
+exit 0

apps/Ulauncher/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$1\\e[39m"
+  exit 1
+}
+
+rm -f ~/ulauncher.deb
+
+sudo apt purge -y ulauncher
+
+#if your app installs any packages, keep this command here so those packages will be removed.
+"${DIRECTORY}/purge-installed" "$(dirname "$0")" || exit 1

apps/Ulauncher/website

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+https://ulauncher.io/