Add Flatpak packaging for iDRAC6 console

- Manifest, desktop entry, metainfo, icon
- Direct Java launch (no javaws/IcedTea-Web)
- Bundles avctKVM.jar and native .so libs
- Parses JNLP for connection parameters
- sign-idrac.sh helper script

com.idrac6.console.desktop

@@ -0,0 +1,10 @@
+[Desktop Entry]
+Name=iDRAC6 Console
+Comment=Dell iDRAC6 Virtual Console
+Exec=idrac-console %f
+Icon=com.idrac6.console
+Terminal=false
+Type=Application
+Categories=Network;RemoteAccess;
+MimeType=application/x-java-jnlp-file;
+StartupNotify=true