Linux: implement automatic creation of AppImage bundle during build of generic binaries

src/Setup/Linux/veracrypt.AppDir/AppRun

@@ -0,0 +1,6 @@
+#!/bin/sh
+# Get the directory where AppRun is located
+APPDIR=$(dirname "$(readlink -f "$0")")
+
+# Execute the main VeraCrypt application
+exec "${APPDIR}/usr/bin/veracrypt" "$@"

src/Setup/Linux/veracrypt.AppDir/veracrypt.desktop

@@ -0,0 +1,11 @@
+[Desktop Entry]
+Type=Application
+Name=VeraCrypt
+GenericName=VeraCrypt volume manager
+Comment=Create and mount VeraCrypt encrypted volumes
+Icon=veracrypt
+Exec=AppRun
+Categories=System;Security;Utility;Filesystem;
+Keywords=encryption,filesystem
+Terminal=false
+MimeType=application/x-veracrypt-volume;application/x-truecrypt-volume;