build: make appimage

Signed-off-by: Ramon Roche <mrpollo@gmail.com>

Tools/appimage/AppRun

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+#!/usr/bin/env bash
+set -e
+
+export LD_LIBRARY_PATH="$APPDIR/usr/lib:$LD_LIBRARY_PATH"
+WORKDIR=$(mktemp -d)
+cp -a "$APPDIR/usr/share/px4/romfs/." "$WORKDIR"
+export PATH="$WORKDIR/bin:$WORKDIR:$PATH"
+exec "$APPDIR/usr/bin/px4" -w "$WORKDIR" "$@"

Tools/appimage/px4.desktop

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+[Desktop Entry]
+Type=Application
+Name=PX4 Autopilot SITL
+Exec=px4 %F
+Icon=px4
+Categories=Development;